This issue is an EXTREMELY troubling one. I live in Greece where there are only two reputable stores that stock genuine Spyderco Knives ( Which l am aware of ) . When l was relatively new to the Spyderco , l was nearly tricked into buying a " Spyderco Endura " with a "440c" blade.
More Recently , we had this Chinese Import fair , where l was horrified to see dozens of fake Spydercos for Sale : Delicas , Enduras, Militaries , Stretches ,Rescues , Workers, Polices. What's scary is that many of my friends are buying them , thinking that they are real.
Regarding your question : I have never seen any of the Hawkbill models ( e.g. Harpy

My favourite) or reverse S models ( e.g The Civilian, my most eschewed knife

) get copied. I have never seen a fake Autonomy , either.
P.S : on a related subject it is incredibly easy to identify a FAKE serrated spyderco. The serration patterns are ridiculous.
And many fakes have the spyder logo printed on the blade instead of laser etched , so you can scratch them with your nail to see if they are fake or not.