Here you go. Contact with Joe should put an end to any speculation. I sent a message to the seller about the knife and who it was that authenticated it. Here's his reply:
His name was Joe (I think) he is married to the Buck grand daughter, they were both at the Eugene Oregon knife show and are a part of the business. They had a wonderful collection of the lucite handled Buck knives at the show. I'm sure there would be some way to contact them through the Buck club and he will remember my knife, the knife show was just last week end April 14th - 15th. I guarantee you this knife is 100% genuine.