Don’t relabel them, just add a note explaining that you held onto them until the right person that it belonged to, showed up. It would make it seem even more special. Would you recut a diamond because it was not new? No you would not, quilts are the “diamonds” that we leave for others when we were gone. I would just point out how long it took to find “the real owner”. It is still your quilting history.
Themadpatter is right.