There's an easy fix! Just go to the old site, old quicksearch, by author, letter, and ctl-f for your name. Presto, all your stories in a row, with "Written by [you] for [someone] for the Yuletide [year] Challenge" right there.

When I uploaded mine, I looked at that and just backdated everything to December 25 of whatever year was appropriate so I wouldn't forget.