Bought a few X99 motherboards recently as they were a good price.
1 looked like a return in genuine box, no accessories but board was absolutely fine.
2 x MSI OEM boxed jobs, possibly manufacturer refurbs. One was fine one had a couple of repaired pins. Again nothing else bare board.
Sent the one with repaired pins back.
Biggest issue is no O/I shield. Some manufacturers are good at sending them out (gigabyte are great at this) where as Asus will tell you to go to try eBay!