Tip - Should I accept USPS money order as payment for an item?

Should I accept a postal money order as payment for an item? The buyer has over 1700 positive feedbacks using them (or so he says). If I accept it, how do I close the auction? Any help would be greatly appreciated. Thanks
Tags: 14 day return policy, 7 in tablet, buyer, buyer protection, ebay, Mississippi, refund, return, Seller, selling