Yep, that's my M.O. A day late and a dollar short.
Well, we will proceed under tha assumption that Verdis is using a sunrod, attached to his crossbow as per usual. And nobody has the +1 flaming longsword on their character sheet. And I'm pretty sure you didn't sell it, but maybe you did and I missed it?
I have my doubts whether anyone but Thanee would know for sure, since you don't, but I'm almost positive that Thanee will have the genuine, true facts of the matter.
But I'm pretty sure that it wouldn't have been sold, but just re-assigned to some party member or other. Surely it wouldn't have been sold! Trevor would have tried like anything to prevernt THAT from happening! He LIKES his nifty new warhammer, but COME ON, a flaming sword??