It happens. I exchanged a damaged Grado cartridge for a higher level cartridge in the same range. The original Platinum had woofer pumping problems with my TT arm, so I was going to buy a new TT and drop the new Grado Master3 in that. Never bought the new TT, went in another cartridge direction and never played the new Grado. I took it out of the box to take pictures and some lucky buyer got a screaming deal on an un-played cartridge. I try to be honest about use for gear I'm selling - like I track all hours on my cartridge stylus' so I can fairly represent wear.
YMMV
kn