Bought an 18V brushless angle grinder from Amazon, noticed they had an "open box" one for £30 off the "new" price, thought their return policy would make it a safe enough bet to send back if wasn't right.
Whoever returned it had obviously scuffed a couple of the corners on concrete/tarmac (which I'd do within 10 minutes anyway) blade was unused, but the guard was missing a screw so couldn't tighten clamp, first one rummaged from the random box of bits was correct thread but a few mm too short, second one was just right, bargain.
Oh and it came with two side-handles, so maybe it was bits from a couple of returns?