All FSIDs missing

I have a disused, small eos instance (4.8.49, el7, quarkdb) that I just hopped on to copy all its data off and retire it.

The mgm seems to have no idea that it once had 45 FSIDs. EOS knows about the FST that owns them but an fs ls returns nothing. The metadata still remains, so that’s nice but I’d really like to get my data back.

Is there a way to register an fsid that exists without relabeling/trashing the existing data?