I have lates from 2013 to 2014 on my Navient government loan. I disputed with all 3 CRAs and here are the results.
FICO scores pulled from MyFico.com 2/7/2019 EXP 656 EQ 696 TU 680
Experian no changes
Transunion removed both accounts from my CR.
Equifax updated both loans to show paid with no lates though it shows them being Sallie Mae.
Experian and TU show the loans as Navient.
I have screen shots
My loans are in rehab. So I actually have 6 loans on my Experian CR. 3 from the original loan comapnies and three from the collection company that was assigned by the guberment.
Something else to watch. I disputed online the last original servicer on TU at 6 AM Pacific and got the results 7 hours later. I was sure it was verified but the results shows it was deleted from my CR. As of right now once Rehab is done my Equifax and Transunion reports will be free of any student loan derogs.