Steam Trading Card Beta Access - Extra Copy

It's worthless, except if you're a weird collector. xD

It was awarded back when trading cards were just about to release to the public. It's a beta access that you received. I used to have Steam Mobile Betas too.

They just stay in your inventory, they never expire, even though the trading cards are long out of beta.

People pay for that iirc, sell/trade it 🤑

In reply to your question, I believe that if you try to activate the gift it will not even let you redeem (since the Beta is long over).

Check first, but I also think your inventory should probably indicate that it is not marketable anymore. As Shanti and Shamrock have stated, the only purpose at the time should be collecting or trading. Since current value should not be considerable (look around with Google, just for safety's sake), I'd say collecting... seems at least fun as a token to show time on Steam ^^