Blocking and Reporting would be the best alternative as he is just some sad kid trying to get your items for free. I'd advise not clicking any of his links either.

That guy is an impersonator. Do not give him anything stubbs. I saw you commenting after I tried to leave a warning in his comments. He just tried to go after my friends Birthday present with the same BS. He is not a Valve employee, He can not get your account banned. He is trying to have you "Verify" your items so he can take them from you and say "Oh they were duplicated." He is a scammer. Beware.