I changed my mind about my Buyback offer. Can I return the cash and get my items back?

Unfortunately, no. When a cash offer is accepted and paid out, there is no way to void this transaction. When we receive the buyback items into the system, it clears the record so there is no way to see what the items were and there is no way to pull them back out of the system. 

When cash is given for a buyback, it is a final sale.