It is definitely a bogus buyer. I just got the following email back from a Richard Butler ([email protected]):

Hello
I really appreciate your response to my email.I want you to  consider
it sold, pls do withdraw the advert from craigslist to avoid
disturbance.I want you to know that i will be paying via bank
Certifield check .I will you to provide me with the following.
information to facilitate the mailing of the check to you .

1.....Full name to write on the check
2.....Full Physical address to post the check
3.....City, State and Zip Code
4.....Home & Cell Phone to contact you

*** Note that the payment will be shipped to your address via UPS NEXT
DAY SERVICE and I will like you to know that you will not be
responsible for shipping i will have my mover come over as soon as you
have cashed the check** Thank