If the original paint is flat black, they're older boxes.
It'll be very interesting to see some pics.
Also take notice if they're constructed of 5/8 (mod 825) or 3/4 (mod 828) inch plywood.
The 12 inch woofers kinda throw a wrench in the works, there were never any VOTT's with 12 inch woofers. I suspect either the term VOTT is being abused, which is common as people like to call anything with the altec name and a horn VOTT, but that's doesn't make it true.
Whatever happens, if you're not taking a vehicle they'll fit in, take tools and immediately pull the drivers and bring them home with you if you make a deal. Don't make the mistake i have in the past only to have the lady hand you back your money when you go to pick them up because she's sold them to somebody else for more.