Some CAs still hang onto them. We had a debt show up for DH's ex-wife from 1997. They sent a copy of the med bill w/ DX codes & everything.
Also, when I paid off a debt w/ DRS, they dug up and sent (without any request from us) a 3-month history of phone records for a phone DH's ex opened up in their home after they had separated. Closed out in 1999.