If you've ever worked at a factory or large business before,
you might have dealt with this firsthand.
Many folks don't even notice, as they clean their gun
after they shoot it.
Many units are never used, or used as displays, or sold,
shipped, and never unboxed. So the end user never notices abuse.
There's a certain amount of ambivalence at the factory or
wholesale level, and the first owner of a product, many times, is
not the first "user" of that product.
Carefully examine the unit with a magnifying glass, in bright
light. Perhaps a factory exchange for a mint unit, for which
you originally paid, is in order...