VERY COOL! How old are they and what do you want for them? Where ru located?
The pair of cabinets were built using Baltic Birch around 2008, each is presently loaded with only one Lab 12, the empty hole has a cover plate.
$600 per pair plus shipping, unloaded for $400. Shipping weight is around 80 lb with one driver, about 55 without, usually have used FedEx for shipping from Santa Fe (87505).
I could sell them "as is" with or without the Lab 12 cones. "As is" would not have input jacks, as they presently have EP-6 and you probably use Speakon, about a $3 inlet IIRC. The EP-6 connectors I use are getting hard to get and are like $25 each...
The speaker cover plate works OK, you could start with a pair of cones, and later add another pair if you wanted more upper output. The response below shows the single 12" compared to the dual 12", both with the same BW25 125 Hz filters.