IMHO, being 'used' will effect the value a lot for a reseller. KOs indicate 'used' a pigtail shout it.
'Used' and 'old' will really hurt.
I had a 300KVA, 4160 to 120/208, delta/y, dry, Challenger that was new, installed for 9 days, taken out of service, and it sat at my shop for 5 years! I still had the factory paperwork, bill of laden, etc. Could not get a dime for it.
It was Al windings, so the scrap value was squat; I wound up putting it in a dumpsterwhen I moved and started to close shop.
