ReRoll

Thank you for helping answer

Thank you for helping answer

Also don't think you can re-roll within 7 days of the giveaway ending unless the winner accepts that and you have proof of it (usually the winner then writes it in the giveaway itself)
Meaning you have to wait for the 7 days, ask for a re-roll and add proof of that you tried to contact then and then you wait for a moderator to re-roll it for you.

It does, because now you can no longer be sure that the key is still valid. In theory, your key could be used now. Based on that uncertainty, I got denied rerolls in the past in a similar situation. Only solution then was to delete the giveaway with winners permission.

I don't think they will reroll for you if you forgot to set region restrictions because the new winner could have the same problem.

Also, if the winner contacts you after the 16th, you can simply apologize, explain what happened and ask the winner to mark the giveaway as "Not received". I do not think this will create problems for you in the future. I hope not, because I have had to tell a a winner to do that for one of my giveaways.

If 7 days pass and the winner does not contact you, I THINK you can ask that the contest be deleted because the key is no longer available? Someone more knowledgeable than me can confirm or "debunk" that?