Planes is quite correct in what you can expect from a salvage load, however liquidation covers many different kinds of conditions and Shelf Pulls shouldn't be confused as salvage loads.
A salvage load, as Planes said, is the worst of the worst It's the garbage end of the liquidation market. The next level up for the type of products you are searching for would be Customer Return loads, not always easy to find now as large reconditioning companies are contracting direct with large retail outlets, and locking down the market to a large extent.
Those with the experience in rebuilding these types of products are usually the ones that will buy salvage loads, at worst they get parts stock, at best they get enough to rebuild from the load, or from previous loads.
What tends to happen in a bidding situation like liquidation.com presents, a lot of inexperienced sellers join in without understanding what they are bidding on, and end up driving the lot past any sort of value for anyone.