Hopefully you read the previous posts to see how the scam works.

Suggestion:
Ask him to send an USPS money order, and ONLY an USPS money order.
You can then bring that MO to the post office to see if it is genuine, and use it to pay the shipping on the package.
If the MO is phony, do not ship the package, but give the MO  (along with the envelope in which it came) to the postal employee, so they can pursue the faker.

they hit me up on Craigs List same story honeymoon assistant etc I have contacted craigs List and the police

Same story here. Found me on Craigs List and sent me money order saying his assistant mistakenly sent to much and wanted me to wire him the money back. I then contacted MoneyGram and they told me they were fraudulent MO's. Local Police told me the same thing. Fraudulent Money order.

Yep...contact about Craig's list item I have for sale...I work for a company that deals with money orders and Western Union...told him the ad says cash only...no response back. Not getting one over on this girl!

Ditto.  Assistant sent too much in the MO.  Can I repay the difference.  Haven't received the MO yet but I am duly warned