I sent my Kindle Touch in to the Trade-in program and set the option for do not return. My Touch was in perfect condition so there was no issue with getting the highest trade-in price they offered. I cannot remember where I set the option to do not return, but it was on one of the screens of info I filled out when submitting my Touch.

EDIT: BTW, the company that was purchasing my Touch had it for 4 days before they finalized the payment, even though Amazon claims the payment will be made within two days after receipt of your item. On the third day I called Amazon CS to check on the order. CS confirmed that the company making the purchase had indeed received it three days prior. CS told me that if the company making the purchase didn't pay me by the fourth day that Amazon would go ahead and put the money in my account themselves. Great customer service! I got paid the next day, though I have no clue whether the money was from the purchaser or from Amazon.