[wrench]

“That’s why you buy from a reputable company, and not a pawn shop.”

But what do you do when you try to trade that noname piece of metal for something you need. Doubt you will be able to get it assayed or vouched for.

[Yosemitest]

Keep you "buy" paperwork to prove they're authentic.
And depending on just how bad things are when you "liquidate" them, you can always "sell" them back to the company that you bought them from.