Slightly different variation of the scam.

1)You receive fake check/money order.
2)You cash it.
3)You buy some hot items and send it to intermediary for further reshipping to Africa or Eastern Europe.
4)They tell you to keep 10% for yourself and wire whatever is left back to them.
5)In 3 weeks you will find that your bank account is frozen and FBI wants to talk to you.
6)You will have to return to bank amount of fake check.

Thats all major steps of this scam. Sometimes they will only scam you on wire transfer, sometimes only of reshipping and sometimes on both.

Anyway, I have seen thousands of scam like this and I can give you 100% guarantee, it is what it is. If you do not trust me, check whatever "check" you will receive through FedEx with bank manager. Call issuing institution/bank and ask them if sender account even exists. Go through due diligence and you will not be scammed.