Why not start a reference collection? While sale to "qualified" buyers is OK, releasing such items back into the general stamp market is likely to result to seeing the stamps surface on
ebay without a proper description. It is also possible to donate the stamps the American Philatelic Society Expertizing for the reference collection. For covers, the United States Philatelic Classics Society has a "SCRAP" project for faked covers. Once donated, the covers will be documented and will be held in a repository to keep them out of the marketplace.
Clark