Hmmm, I wonder why the railroad jack sold for $75 when the opening bid was supposed to be $150? I have no clue as to what those are really worth but I do know they would be a monster to move and display. I would think it would be of interest to only a museum.
My question is why are you being the high bidder at an advertised auction and you know nothing about what you are buying? Do the other competing bidders know something about the market that you do not?
I think the items are worth what you paid and the under bidders dropped out because the prices had reached the current auction market value. JMO.