- I don't think it's a B n S, TCP, Griot's, EBay, or Chinese pad for the simple reason that almost all of those foam pads I've seen use white Velcro for the backing. We know it's not a Meg's, Rupes, or Cyclo pad.
- LC seems to be one of the only (the only?) manufacturer that uses black Velcro for foam pads about this size.
- it's not a standard LC "flat pad" because those are sort of beveled on the edges.
- it looks like a LC CCS style pad that never had the dimples cut into it. Maybe they were "blems" and never made it to the dimpling stage - that's why you got some freebies? Maybe the foam density was noticed to be "off", that's why they feel different?