To address the OP question: I don't think the sails are worth taking to a loft to have evaluated. I think, as rgranger said, they are worth hoisting to see how they look. My guess is not too good or they wouldn't have been included as "Extra sails."
Going back to the Boat Ads thread, it drives me nuts to see ads with 15 included sails 13 of which were replaced because they are rags. As if it's a favor for the buyer to take up room in his the garage or attic for a bunch of crappy sails. There are very likely no pearls in there. The spinnaker is different. Maybe on that one.
