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I would advise her to contact the Army and Navy with the nomenclature, part numbers, and serial numbers, to see if it was stolen, before she tries to sell it. I know that the Navy is very good about tracking old stuff. I don't know about the Army.
This way, is she if up front and honest, no harm to her.
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I worked in an old building, that had a wind tunnel for testing F4U Corsair Engines - think Pappy Boyington here. Anyway, we called this tunnel the 'Time Tunnel' because all the old equipment in it dated back to the 1940's. We didn't submit, and were not required to, any inventories of this old ancient stuff.
One day NCIS showed up and arrested an E6 Staff Sergeant for theft of Naval Property. It turns out that this SSgt had taken some of the old electronics equipment to a Pawn Shop in Los Angeles. The Pawn Shop had his Photo on file, and when the LAPD raided the Pawn Shop, they conferred with the Navy about this military looking stuff. The Navy was then able - even after 40 years of collecting dust - track this equipment down to the building I was working in.
A short courts martial later, the Navy got their old useless stuff back, and a thieving Marine went to the Brig.
No kidding, get the stuff checked out.
Lots of old dusty equipment considered junk in warehouses and what not gets taken home. Some even out of dumpsters! Problem is that it can still be considered as "stolen", even if it was taken out of a dumpster!
Get it checked out first.