Check Craigslist help please?!!?

[Abdo]

I was trying to sell a Paris Hilton celebritystyler on Craigslist for $75..
A man responded that he really needs it and that he will send me a check by mail and after I cash it someone will call me and pick it up and that he lives in another state so he added extra money for me to give the person who's going to pick it up and ship it to him..
So I gave him my first name, last name and address.
Today I received a check by FedEx by an unknown person from Texas for $2200.00 written by a computer with that extra long sheet that you tear. I can tell its original
So I'm kinda freaking because I was not even expecting $150
And I'm afraid that the check is stolen or something and when I cash it I might get caught..
But I'm currently unemployed, not expecting any checks..
HELP WHAT DO I DO???????
What's the difference between cashing and depositing?
I still have the envelope..
Should I go tomorrow to the police station?