This is a scammer.

Responded to my Craig's listing, offered me a ck, wait until it clears then send somebody to pick up. Appears to be a scammer on Craig's list in Seattle. I would avoid this person!

I just got a text from this same number and they gave me the same story.  Asked for my full name and mailing address.  I'm glad I looked this up.  I will not be responding.
Thanks!

I am worried know because I gave him my address and name before I realized it was a scam.

Yup.  Seems to be a scam.  I am also in the Seattle area.  The guy contacted me about purchasing something I had listed on Craigslist with a money order that his assistant would send me.  I agreed, and gave him my office address assuming it was a scam, but wondering where it would go and feeling comfortable with giving him a business address rather than a home address.  The next day he said his assistant accidentally overpaid me and asked me to refund the difference with Western Union when I get the money order.  

I told him that rather than cash it I would just hold the payment for when his assistant came to pick-up the item and he could pay me then.  Also said we would meet at a bank so that the payment could be cashed right away.  We'll see if he gets back to me after that.