Does everyone realize that mistakes are made in manufacturing, packaging and that returned parts can be recycled to other buyers?
Assuming anything in a box is the correct part is foolish, especially when it involves engine parts. Would one assume the same with pistons, rings and other parts? Play it conservative and check everything. Otherwise, it's a crap shoot.
As for poor manufacturing and/or quality control, if the manufacturer doesn't respond, move on. Their loss.
S