Found this thread too late...
I wish I would of found this thread a week ago, and then maybe today I would not be out over $3,000...
Allow me to explain, I posted an item on Craig's List and about 2 hours later got a reply from an "interested buyer" almost EXACTLY like you described. I received a check via UPS a couple days later for the amount of my sold item, an added $50 "for my troubles", and over $2,000 to be sent Western Union to their "shipper". After I cashed the check (which my bank did with no problem!) I sent the remaining money as instructed through Western Union. It took a week for my bank to figure out the check was fake and by that time the money was long gone. I actually discovered this thread by entering the name of the shipper into Google. I do believe the person trying to scam you might be the exact same person who successfully scammed me.
This is what was sent to me:
Here is my shipper's information below-----
Name-----Charmaine Barajas
Street address---2152 La Presa Ave,
City----Rosemead.
State------California
Zipcode------91770
If you read this thread I would appriciate you getting in contact with me, I am interested to see if the person's e-mail address is the same, and possibly see if you have any information that might help me fight what happened.
If anyone else here has any suggestions, please let me know, I am currently paying my bank back in payments but I am determined to take this as far as I can go, I do believe with some perseverance this person can be caught.