I knew of a guy who'd take used, but mint condition guns, scrub them spotless, fire every other cylinder and sell them as unfired outside the factory. There's lots of crooks out there.
I sometimes get a chuckle at all the guns I see shown on forums and the new owner states "doesn't appear to have ever been fired" just because it's in excellent condition. Sometimes they'll add, "it it has been fired, it's very little". A friend of mine sold three Ruger rifles to a guy. We later saw the rifles at a local gun show. The seller (who'd bought the rifles off my friend) told me that they were brand new and unfired outside the factory. He got a bit huffy when I told him that it was my friend he bought them off of and all three rifles had been shot quite a bit.