Stolen Quidditch World Cup Trophy is my guess to what Winnie has been looking for.

This was an interesting clue, because it really could mean alot of places. Bethlehem is where Christ was born, so that could be one guess. But the Christmas date and traditions didn't start until later.
One guess could be Bari, Italy because that is where the tradition of St Nick began. Or it could be in Germany where many of the other traditions began. So those are my thoughts.

My package is wrapped and ready to go. Now I just need to get to the owlery to find a strong enough owl to fly it across the ocean.

I got my yarn for Agatha's package! Now I just need to sit down and finish the project. Oh and find a box to mail the stuff in. I hope she likes it!