Maybe this is a little foolish of me, but I have toyed with these people before - my email account has a corporate level firewall, by the way, and I don't use personal identifiers on eBay. Write like an innocent, but don't give them details. It can be interesting to have them show their modus operandi. Spelling seems to be too big of a challenge for them, even if the initial posting was proofread for grammar and spelling. However, leading on the Nigerian princes, eBay wonder dealers, etc gets old after the first time or two. Nowadays I just refer the post to eBay management or to the spam filter.