I will post pictures of the knife when my daughter gets home with her camera, probably tomorrow. I don't know where, when or why the knife was signed. However, it does have the Idaho stamp on it so perhaps it was to commorate Buck moving to Idaho? I read an ad about another knife that was signed at a knife show in Idaho for that reason. I am not an expert, but it was obvious that the signatures on my knife are authentic when I compared them to the other knives online I saw with Sara and CJ Buck signatures.
I bought the knife online from an airport confiscation broker who sells on E-Bay. It was not very expensive and didn't say anything about the signatures. I was very pleasantly surprised, of course. Thank you for your response.
Sincerely,
Rich