I don't know. It is possible that someone could be that dumb. I have seen the occasional Fender with no model name listed over the past decade. But it seems to me that someone who knew they had an old bass, and sold books and records on ebay, would figure out how to find the real name of a 4001 bass. But if someone had a hot bass, or it was an old Univox with a nice truss rod cover, and they wanted to play Mickey The Dunce when confronted, then it would be easy to throw up a lot of plausible deniability if they thought it was a Ricken Lxncker. Especially with that unpronounceable second part of the name. Kinda hard to have a series of consonants strung together and not know you have something off. Like some bad feedback.