Unfortunately it's not easy to spot fake Fenders. Even to those who are experienced buyers and sellers it's not always obvious. Checking the details printed on the neck (after removal from the body) can give clues to the authenticity of the guitar. Also for the body. Checking the various serial numbers against Fender's own records can also reasonably date and verify the model. Seller feedback is not always a good indicator either. For example, a seller may genuinely not realise they are selling a fake. However always lots of questions, get as many photos as possible and try go by your gut feeling. I always work against the principle of if it's too good to be true then it probably is. Good luck.