I would say so, IF it's definitely a 2000S.
As with anything used; cars, music gear etc., any items "true value" is only as much as somebody will actually pay for it.
Books, online forums, "expert" opinions don't mean squat.
I paid $200 for a 2000S cab with crappy CTS's and no grill cloth, and drove a couple of hours to pick it up. I have "expert" friends who think I'm nuts to even want such an archaic dinosaur cabinet, and other "expert" friends who think I got the deal of the century on a piece of rock history. Who cares? I wanted more than the effort it takes me to make $200 so I bought it.
Enough street philosophy, The cab you found might even have re-conable JBL's in it, but even worst case scenario, you could get a couple of nice D or K140's and have a thumpin' classic bass cab for under $500.
I'd do it in a heartbeat, but that's me.