I've seen bass bins sell for <1500... we know what NEW (new design and new driver) 402's sell for... I added a premium on top of that amount and came up with a hypothetical. But once again JJ proved his impetuous nature.
If I were to be honest, I think it's probably substantially less than a used pair if factory Jubilees (which is 5000-6000) based solely on usability (room fitment) and waf factor... but ask what you want for them.
The best proof will be an open auction with no reserve... you'll find out exactly what they are worth... I bet it will surprise you.