It's really sad when a person decides to go rouge. I purchased a pin from Kevin earlier this year and things were actually fine. The pin was shipped so I never met him, but I did speak with him on the phone a few times and he seemed like a regular person and helpful with the shippers.
I hope this gets resolved, but this appears to be a case of theft, and at the very least, Kevin needs to repay the OP, ASAP!