Dude, not to be a doubter but how would knocking them off the shelf kill them all? I mean maybe he accidentally forgot to tell them he knocked them off the shelf, microwaved them, threw them in a bucket of water, and stomped on them...
But seriously if they were in a box it is unusual that they would break that easy, I mean I have dropped cards out of a box and no harm done, I dropped my old IBM 75gxp drive 4 feet onto a cinder block and it didn't damage it... although I about had a heart attack (don't put a drive on top of a full tower case on a desk and then lean the case over to pull a video card out lol ).
But seriously if they were in a box it is unusual that they would break that easy, I mean I have dropped cards out of a box and no harm done, I dropped my old IBM 75gxp drive 4 feet onto a cinder block and it didn't damage it... although I about had a heart attack (don't put a drive on top of a full tower case on a desk and then lean the case over to pull a video card out lol ).