Look up individual components on HifiShark.com and determine the approximate resale values on each piece
While not a complete waste of time, HiFi Shark compiles listings of what people were asking, not what it sold for. The sample size for many items is very small which diminishes how useful it is. It also can't take into account things like condition of the item, how old it is, if it has a warranty, does it include the original box, does it include insured shipping, and a variety of other factors including the very important, how desperate the seller was/is.
So the idea that HiFi Shark can "determine the approximate resale value" is not even close to being accurate. It is a starting point. it can't determine anything.