What brand are they? Sometimes manufacturers don’t have a worldwide database.
Also, sometimes credit returns are stolen, as happened at Rexton several years ago. The only reason they got caught is because they were Costco hearing aids, and were locked.
Many BTE’s and custom faceplates are now made in China, and the factories are notorious for running “extras” on the production line. [Contract record pressing factories were notorious for bootlegging vinyl starting in the 1950’s, selling them out the back door and cheating the artist out of royalties.]