Having completed 5 of 18 trophies (reaching tier 1 of the Spring Cleaning badge) granted the Steam user a Spring Cleaning background, 3 emotes, and a mystery box. Description of the box states:

This item might be useful in a future sale.
Earned for participating in the Spring Cleaning Event in 2018.

Any guesses? Personally, I predict the mystery box will relate to Valve's new card game, Artifact, and perhaps Steam users who have the box may obtain an Artifact card or a card pack. Why cards? Well, Valve has released items with price tags for other games the company has developed. CSGO has skins, Team Fortress 2 has the hats, Dota 2 has market items on the community market (I am vague on what Dota 2 has). I cannot deny Artifact might have marketable cards in the future. Even though the description mentions the box might be useful in a future sale does not indicate the item must relate to a sale; just that an event coinciding with a Steam sale is possible such as if Valve released extra information about Artifact during the summer sale for example.

Edit: To add to my prediction, Artifact on the Steam store has a 2018 release date.
2018 Spring Cleaning event page
Spring Cleaning market items
Mystery box listing

Edit: The Mystery Box contained cosmetics for your alien in the Summer Sale 2018 minigame called Saliens.
https://steamcommunity.com/saliengame/play/

5 years ago*

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It's a binder. For summer sale activities. And after you completed the summer sale task? another mystery box.

5 years ago
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Mystery boxes all the way down.

5 years ago
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A discount coupon. But by knowing steam's greed, I think it'll probably be either for a specific game or it'll be a non-stackable coupon. xD

5 years ago
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I'm hoping in a cat

5 years ago
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It will contain a certain number of Steambucks that can be used in Steam's Summer Sale Casino game were you can win more Steambucks playing slots, video poker, etc. and then if you win enough you can go to the Casino gift shop and buy things like maybe certain games or backgrounds, emotes, etc.

5 years ago
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View attached image.
5 years ago
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when you open it there will be a Snake

(hope no one made that joke before me)

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5 years ago
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You are the first person to mention Snake.

5 years ago
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gut, gut

5 years ago
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something disappointing, most likely

5 years ago
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+rep

5 years ago
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I would think it's something related to the summer sale. As to what exactly, I agree with the commenters who said it'll be something disappointing :D

5 years ago
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it's half life 3 for free !!!! nah... comming from vale im sure it's some sort of crappy "sticker" to some crappy steam sales "pictures album" XD

5 years ago
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I +1 the dissapointment.
Then again this was the first event since the Summer Clicker game where Valve cared to bother, even if slightly, so maybe they actually have something planned again for the Summer rather than just a snoozefest sale with everything upfront, no dailies or flash to get your excided and check more than once every day just to @#%%# the discovery queue of shitty recommendations.

But yeah, it'll likely be a random coupon or one trading card or something.

5 years ago
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Just an empty box. We are all cats and there's no better gift than an empty box.

5 years ago
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Now you make me think of digital pets on your profile (like those walking around on your desktop that was popular ages ago)... and I get sad because that 100% ain't happening.

5 years ago
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Wow! That viruses were so cool and good looking that nobody cared about all the ransom and trojan hidden inside them!

  • Oh! Look at that little one stealing all our saving, he's so cute!
5 years ago
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Since it is Valve, the most likely possibilities are:

  1. Randomly assigned coupon from the standard coupon pool.
  2. A low-level lootbox cardpack for their upcoming lootbox card game.
  3. A random 3-cent TF2 hat.
  4. A random 3-cent CS:GO skin.
  5. An additional summer sale trading card, but not a foil.
  6. An extra special sticker for the summer sale album.
  7. A one-time offer you can put on any support ticket that will make it closed one day later than usual, but still without any human answer, just the normal computer-generated one.
5 years ago
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I think it will be more than one item but they will all be small things. Since it is from spring cleaning I'm guessing it will be a random assortment of emoticons and backgrounds from previous sales, as if the box contains the random crap that has accumulated over time.

5 years ago
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This is anything might be useful in a future sale. Isn't cards, games and in-games items, these things isn't useful in a sale.

5 years ago
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Maybe a Boat!

I'm sure it's a boat!

5 years ago
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5 years ago
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This!

5 years ago
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5 years ago
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All the ills and bad things in the world. But don´t worry, there will be hope at the bottom...

5 years ago
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Jokes apart, i´m pretty sure that there will be cards from the sale

5 years ago
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It contains a giftcard about 50€/$ or similar currency value for each registered user within an apologizing letter for every stupid anti-customer rule and platform "feature" during the last years. That's why the package is a bit bigger because the letter is so long >.<

A plush penguin would be also nice ;]

5 years ago*
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Another Loot Box for which one then has to buy a key ^^

5 years ago
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Bit late but here's my guess:

Could be ticket to Big Steam Summer Sale 2018 Giveaway, with something like these games as prizes

Maybe with other ways to earn tickets too (aka spending money).

5 years ago
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This is list of games that got no cost sub within last 24h?

5 years ago
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yeah.

5 years ago
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Sweet, some wishlist titles in there :)

5 years ago
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It's Bad Rats, right?

5 years ago
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no half life 3 there

5 years ago
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A Steam 90% coupon, those are rare these days! :O

5 years ago
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Has anyone opened their box yet? Mine has an "open box" button now, that the sale started. However, it also warns me that opening it cannot be undone, so I'd like some more info ... depending on what others found in their box, I even even keep it for the Winter sale, if that's possible?

5 years ago
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It's just cosmetic items for your minigame alien

5 years ago
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same here

5 years ago
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5 years ago
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I opened mine and I think I only got some hats and clothes for the alien in the Saliens game.

5 years ago
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I see, so there's no point in keeping it for the next sale, huh? I might as well open it then, in a few hours when the steam website actually works again, that is ... Right now, I'm only getting a blank page.

5 years ago
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Just cosmetics for a temporary game? I think I'll keep the box :)

5 years ago
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