Hello, Tara -
I found some information about the Federal prison MP3 players on the Zoukis Prisoner Resources web site (one of the suppliers of services and products to Federal prisons) here:https://www.prisonerresource.com/prison-survival-guide/things-to-do-in-prison/mp3-players/
At the end of the information on that web page, it states:
When you leave prison you can take your MP3 Player with you, but you will have to mail it to the Advanced Technologies Group, and pay a $15 fee, for them to remove the 14-day revalidation security feature.
However, the article does not provide the address for Advanced Technologies Group to which you can send your MP3 player.
I did find the Advanced Technologies Group (Keefe Group) website however. I know Keefe supplies many products and services to prisons because I know some Keefe Group employees.
This is the link to the Advanced Technologies Group / Keefe Group Contact Us web page. The phone number for Advanced Technologies Group is in Des Moines, Iowa. Call that number and ask to find out about sending your MP3 player to them, with a check or other payment information.