This is just supposition, but I'd bet money someone in his shop, perhaps a friend of his, took a fancy to the gun, and they thought the "lost" thing would fly...just give you a couple hundred after you found that it was gone, and all would go away. As it is, you may have exposed fraud, theft, falsification of a police report, records keeping that BATF will probably find reason to pull his license, and a small claims settlement that gives you fair trade (maybe over $1000) for your loss. Best of luck. It may turn out that now being officially stolen, makes the gun so "hot" the person holding it might sell it, and it may turn up....and the TRUE story even available after an investigation.