I got a similar offer. They would send a bank check if I would just mail my 'product'. Reminds one of the Nigerian princess/bankers wife offerings. Craigslist warn against that scam, wisely advises to just ignore them.
I placed an ad for an inflatable and was in the process of checking out my newly place ad when the phone rang and someone wanted information. Sold it the next day, so yes, it can work nicely!
My formula for living is quite simple. I get up in the morning and I go to bed at night. In between, I occupy myself as best I can.