Giveaway simply gone and not registered as closed.

maybe it was deleted

Ah it can be deleted?! My points are wasted...

If you tell us what the game was we might figure what happened (if it's an exploited game for example)

edit : I thought you meant a giveaway YOU created, my bad

Vanish?

creepy......

I believe the game is the one from the latest dev giveaway, thus it was deleted.

once happned to meh, had a talk with cg liek i always do, what happned was the creator told support that he thought the keys were working but they didnt soo they removed the giveaway from steamgifts, and left no trail