I have some of those streetpaper.de Advent calendar models dated 2004. Missing from that year are numbers 1,2,15, and 17. The next Advent calendar files from streetpaper.de are dated 2010 so there is a large gap of calendars that were not collected by me.
It is always fun to search the Advent calendar graphic on the site to find and download the files. The inclusion of some bonus files available for a small donation is a nice addition to the quest.