You're right, it isn't easy but someone will do it if there is money to be made. And in IPs, there is. I actually got one that had the rear sight dovetail milled down to remove stake marks. If I hadn't had Harrison's book, where another such abortion was pictured, then I would have been stuck with it. What I encountered more frequently was the convenient omission of certain interesting facts, such as import marks, reparkerizing, etc. It just ain't worth the hassle.