New won alert for a 3 month old giveaway?

Maybe someone asked for reroll, maybe more than once? It is wierd for that old giveaway, but it could happend.

It might have been one that has been rerolled s few times.

Possible it was a fail to deliver 3 months ago.
The gifter finally got a key and the guy that won didnt respond.
Gifter gets a re-roll and you won.

Send a note to the gifter and see what he says.

Yes, old rerolls happen. I once won in a giveaway that ended a year ago... And I already had the game.
I would first contact giveaway creator and ask them to request another reroll. And if they won't agree - I would mark as not received and call it a day. Of course, if you don't have the game already - you can just redeem it and mark as received.

Reroll for sure.

Update for anyone who cares: it was indeed a reroll after the original winner failed to redeem the gift after all this time.
Thanks everyone who answered.