Nice scores, guys!
Rockfan - I have a block of knives like that too.....was being thrown out - all in excellent condition and a complete set!
Quite a few homes around here are having their metal roofs replaced from hail damage a couple months ago. Most are aluminum standing seam panels.
I was able to scarf a few from the contractor doing the house right behind me. I have them stacked on my garage roof for now but will move them into a better storage area soon. Aside from the many but very small hail stone dents - they are in almost new condition. I will use them when I build my boat canopy later this year...plus whatever else I need them for. They range in length from 8-15'!