Anyone ever deal with this Ebay seller?

"nick-gbcoins" located in China. Seems to have a lot of nice British material, but I always am wary of material originating in China. Feedback as a seller seems solid; a fair number of medium-to-high-dollar coins sold with positive feedback.
What's really putting me off though, is his manner.
I sent him the following inquiry:
What is your return policy? I would want to submit the coin to NGC for authentication. No offense intended, but I am concerned with the number of counterfeit coins originating in China (where you are located). Thank you for your time. -Dan
to which he responded:
I have never sold any counterfeit coins. So return policy isn't offered. Please don't bid it If you don't trust me. NICK
I suppose that in and of itself should tell me something...
What's really putting me off though, is his manner.
I sent him the following inquiry:
What is your return policy? I would want to submit the coin to NGC for authentication. No offense intended, but I am concerned with the number of counterfeit coins originating in China (where you are located). Thank you for your time. -Dan
to which he responded:
I have never sold any counterfeit coins. So return policy isn't offered. Please don't bid it If you don't trust me. NICK
I suppose that in and of itself should tell me something...
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