Your auction listing most certainly does not mention the parachute being "unairworthy". IT does say it collisaped behind a hangar, but that really means nothing.
I'm like Mark, and really regret not bidding $70.00. PD makes every one of there parachutes the same (not like Icarus, where 1 Xfire may fly completely different from another). that being said, its highly unlikely that you were the only person in the world to ever purchase a "defective" PD canopy. A Sabre1 can be a tricky parachute to land, you obviously can't land a parachute, and there for in your mind its defective. Thats right, when that student couldn't stand up his PD230 it was defective too.
You screwed up all the way around. I've got a bunch of old "unairworthy" canopies, but I'm in no hurry to list them on eBay for $50