No experiation dates should come off under no circumstances.
If you can rub them off in any way or if tape makes them come off....they're fake bro!
I actually got fake iranian test amps one time from a domestic source off steroid enclopedia site....I told my source I knew they were fake....but he kept saying he got them from the embassy himsellf...lol...I said hell no.....he agreed to give me my money back if I sent them back to the address he gave. I did, and sure enough He sent me my money back. I lucked out...I hope it works out for you as well.