Basically, you are asking 'how to clean up a moodlerooms site that has been migrated to an internal server' ... which is something very few folks have done. It is not something one could describe in forums ... not a 1-2-3 thing at all. Much has to be explored and discovered ... then what approach to take to eradicate moodlerooms from the site.
Isn't that a shame ... moodlerooms not removing their addons/extras before providing you a copy of your files!!!! One thing for sure, your entity won't be going back to MR, right?
Anyway, have just finished eradicating Remote Learner stuff from a Moodle brought back inside the entity. Same thing there ... RL not helpful. Eradication required some manual manipulation of the DB tables. And, had to work on a hidden Apache Virtual server that was on the same production server (to be in the same environment) - basically a 'mirror' of the production site - minus it's own data directory as the production server didn't have enough space to replicate that to the 'sandbox'. Working strictly in the 'sandbox' code and DB with NO file uploads or anything that might stick 'orphaned files' into filedir managed to rid the 'sandbox' of anything RL. Then, it was a matter of timing ... move what I had done in the sandbox back to the production site without loosing too much of the new work etc. that had been done on the production site that was still being used while work was being done on the sandbox.
Can be done with MR as well, I would imagine, but it would require not only access to moodle Admin but also command line and direct access to the DB. And it would take time ... probably longer than you have, right?
You can find my 'regular' EMail address in my profile if you'd like to discuss/cuss OFF this list/forum.
'spirit of sharing', Ken