This is what I did with my unidentified Chinese overprints many years ago. Most of them were all tossed in a bunch of glassines/envelopes and put in an unmarked bin with assorted other items inside a box that looks like several other boxes, and then placed in some location behind a wall of boxes that are at least 2-3 deep in most places. Even if I WANTED to find them...
Doing a dozen or so of these every once in a while is OK, but going through hundreds or thousands of them...

k