cosmetic second: the item failed quality control inspectiion, because it was not first in all respects. However, it is perfectly functional, and the only defects are in appearance (cosmetic).
In this case, it means the pickup sounds as great as any other, but something probably looks less than perfect about the plastic housing. Maybe there is a bubble void, or a swirl, or with certain pickups (I forget which ones) it's possible that the copper cage on the coil might be slightly visible.
My guess is that if one looks really bad, it just gets thrown away, and that Mica's small collection could be a good deal. If you're really interested, you should probably contact her directly for a more specific description.