Go inside of the boat and found a cabinet locker or a bilge
area below the waterline, you know this spots where the builder
forget to aply a layer of gelcoat
, cores are easy to spot inside , normally you see the blocks of balsa trough the inner layer of glass, get a flashlight to see it better, i hope that model dont sport a horrendous pan liner and you can reach a spot where the core
its visible, and nothing wrong with the core if the boat get a well maintenance
over the years, truhulls , moisture, blisters
etc... or ask to the owner, broker
to remove a truhull , not big deal..... good luck.