I don't think you should refund him I would try to fight it first . This seems like buyers remorse . Why wait this long to contact you on this . If i thought it was fake i would have contacted you the day it was opened. I know ebay wants people to give 15 day return policy . So i think that past.
Collect Drew Bledsoe, 2012 topps Chrome , 91 Stadium Club football PSA graded. 1993 SP Football PSA