Welcome to AAPK. As you’ve discovered the hard way, buying knives on eBay can be pretty much a crap shoot unless you know who to trust and who to avoid, or know enough about knives to keep yourself from getting skinned.

The good folks here on AAPK can help with that. If you haven’t found it yet, go here
https://www.allaboutpocketknives.com/knife_forum/ and scroll down until you find the forum titled “Counterfeit Watch”. You can learn a lot there about both knives and sellers, and if you have questions about a knife you think may not be correct, post it there with pictures and a link to the auction and ask.
There are some good sellers on eBay, but there are some crooks also, and some that are just ignorant about knives and don’t care. A great place to buy knives is right here on AAPK. Good knowledgeable sellers for the most part, and a member community that police the stores. Fortunately not much policing is required here.
Ken