Interesting find, I’ve not seen this exact set up before. The main still has the grounded conductors, but the ungrounded conductors have been diverted to a new remote installed directly behind the original panel. The remote still has the jumper, so if anyone else installs a branch, there isn’t really a bond to the new can or separation between the ground/neutral in the remote.
Hadn’t looked in my ugly’s for fill req’s yet… but I don’t think they made it
As it’s an REO, there’s a couple of date-related requirements I can’t really discern, but… oh well.
Thought I’d share.