The auction house(s) live by the creed of "nothing is true, everything is permited" . A sad state of afair since many collectors normally wouldn't recognise forgeries, like Michl already stated... by using old wood and restocking an original hand cannon for instance (multiplying the price by 10 times of the original cannon barrel).
Always keep in mind what the purpose of a business is!!! I studied business economics so i know at a certain level what the point is, Profit and Continuation. If it would become common knowledge that this auction house is mis informing people on purpose (a hard thing to prove in a meaningfull way
) the continuity of this auction would be in jeopardy and so would there profit.