What should I do, if the winner didn't clicked on the positive feedback for days?

Wait 7 days.
From there, if he already activated it, ask support to mark it as recieved.
Otherwise, request a reroll.

Wait for 7days and then open a ticket with support.

Meanwhile, you may contact him by sending an email or via steam, adding him as a friend or leave a note on his profile. ;)

^^ larry156 was faster than me :p

I like your solution. DO IT!

I didn't even think to have a favourite jar. BUT ALL THAT CHANGES TODAY. I have decided, and it is the kind that is hard for strangers to open and poop in!

View attached image.