In my expierence buying from Canada [so outside of the US] for small stuff they often don't even ask you to send it back.
From memory I've had:
1) Ordered a #1 board got a #0
2) ordered the lens shade didn't get the mounting
3) I know some thing else wasn't perfect but can't remember.
I was just told to keep everything. They mailed me a new correct board for no added money. Quickly credit my card for the cost of the shade.
OTOH alot of the time I'm only looking at the bargain stuff. The rule I learned long ago was stuff that looks too nice was never used. You need to ask why wasn't it used? Often it's because it's lived it's life in the repair shop.