You will have email access to the accounts, so you can do whatever you want with them.
What can you do with these?
For starters, Amazon has a lenient refunding policy so you can receive credits for any recent order on the account.
For eBay, the possibilities are endless so I won't even both mentioning how to monetize from these.
So, would you be interested? If so, how much would you be willing to pay?
Would love to get some feedback as I will only offer these if there's enough interest.
Hope you aren't selling mine, lol. I'm broke as fuck and that's the last thing I need right now. :)