Personally I would stay away from that pile unless there are things in there that are easy to sell on ebay. Remember, if he was a Tech then he knows if something was worth fixing and selling. My guess is he sold a lot of stuff he fixed and resold. I would think if there were value in it locally to resell he would have it fixed and resold. Used parts are just that, used... and they really don't bring much just as parts.

Now, time card stamp machines are cool. I have sold a couple on Ebay with good results... look up the model numbers if you can get them. I have sold some office phone systems for lots of money on ebay also, but have walked away from pallets of phones that have no secondary market.

Everything has some sort of scrap value. Copiers, fax, printers have stuff in them, but are time consuming to strip out... depending on if your yard takes them whole as scrap or not.... Mine won't. Toner cartridges are worth $2 each at staples.

Monitors have their own threads on SMF. Copper yokes, wire, and low grade boards... if you have somewhere to dispose of the hazardous glass they have some profit in them. Hoss is very experienced with them.

Computer towers have scrap value ($8-$13 each). Keep looking for these in that stack.

I guess it depends on if you have the time to move it, storage to store it, and time to strip them out... and of course Capital to buy it. I don't have any of that so I would cherry pick the pile if he would let you.