If you can, look for the line that says "submission time" when you upload. If you can adjust that number, see if you can adjust it to match the date in the warbirds archive. You can see this time stamp on the download screen, or on the main file page of the archive, on the bottom-right-hand corner.
If you can't adjust that (that may only apply to moderators) than I'll have to do it. But I appreciate the effort, whether you can or can't!