It's probably too late now, but I would say DO NOT REPLY at all. Just delete it. I replied to an iffy email once and now I get tons of spam...
AGREE AGREE AGREE! Just posted several items to CL last week and got one "were intrested" email. That was the entire email! I know better than to respond to that... they are after emails to spam. And when they get it, it goes into a database, so you will get spam from hundreds of emails.
There are sooo many things in this reply email that are huge flags: the way it "reads" in general, which is not like a normal conversation or message; the fact that he specifies "US Bank Certified Check or money order" when CL sales should be made in cash for the safety of all parties; the fact that he offers to pay more than the asking price, which no one does; the fact that he needs so much personal information from you when anonymity and safe-place meets are key for CL sales; the fact that he wants you to be responsible for shipping and will send you the money, rather than picking it up himself a la the CL way; sentences like "After the information is been supplied,I will give you an update on the payment"; he wants to be your favorite buyer why exactly?
