I think is a matter of viewing.
consumer has all the right to get back supplier if receive unsatisfactory goods. what I knew recently is tank maker even replace 2 set of 5x2.5x2 tank (on the spot swap) without question ask just because got some air gap in oyama pasting.
what i see is just get back to them will do; rather my ffiend .. your friend and I believe that he might not even receive that complaint at all ..