Any way to confirm these ESEE knives as real?

[nahwhataboutit]

Hello, New to these forums. I'm selling a couple of my ESEE knives on ebay and a bidder has asked me to confirm that these are genuine and not counterfeits. I honestly don't remember the dealer, and now I'm paranoid. Anyone know enough to be able to tell?

http://imgur.com/a/qBfFg

I know the sheath is a big hint, so I posted a representative close up of one of the sheaths. Any help would be appreciated. Thanks!