Exactly the same here. BIG RED FLAGS: He would not accept a P.O. Box number even though the item for sale was not at my house. He would not give me his name or the name of the company the "certified" check he was paying with would be coming from, nor would he call me, all communication was in text form. I don't know what exactly his scam is, but I am sure it's a scam! B E W A R E !
Also in response to a Craigslist ad. Uses "Nigerian" scam English. Claims to be a "very busy man" and is interested in a high-priced item for "immediate purchase."