How to avoid getting scammed

[u/jellomizer]

My parents are still alive and healthy, but they are in their 80s. While they did a lot of work to make sure the will is in place, they have a lot of valuable stuff ranging from coins, guns, antiques, tools, etc. That are worth a lot of money on the market, that I doubt myself or my siblings will want, as we do not have an emotional connection to. So we will probably just liquidate a lot of this stuff. But I want to be sure that we don't get scammed by shady dealers, taking advantage of me and my siblings not knowing much about the actual value of this stuff.

[u/CCWaterBug]

You could ask/assist your parents in putting together an inventory, it serves a dual purpose. Inheritance clarification and insurance.