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I thought winner has one week to mark it as received?

try sending to his email?

Well, as stated in the FAQ and Guidelines, winner has seven days to redeem their gift (as you as a gifter have seven days to send it).

So the short answer to your questions is: none and nothing. All you can do is wait.

You just wait... there isn't really anything else you can do currently.
You can't do a reroll unless both parties agree to it or if it's required due to some unforeseen reason.

What you generally do when winner not normally reacts quick?

I wait, they have 7 days.