your thinking of a money gram or a western money transfer mate . both of these can be withdrawn up to 7 days after they have been cashed. so they pay you, you see the funds in your bank and so give them the goods , then they cancel the transfer and have both your item and your money !! im sure ebay banned the use of these 2 ways of paying now due to the loophole.

the best person to ask mate is the bank you are going to put the funds into but i cant see a problem but as said above its up to you mate!!