When your buying supplies from a company that openly and forcefully tells customers not fit for human use, receipts are not a big priority.
Neither apparently, is the molecular weight tests that proved conclusively the substances was NOT Thymomodulin or TA1 but heck, why let the facts get in the way.
The results of the molecular weight testing were ratified by both the ASADA expert and the player's expert so really Thymomodulin is just never going to suddenly appear no matter how many photos they get out of magazines