Here's some visual confirmation of an EB-2 inside an Epiphone Jack Casady hard case:
https://www.talkbass.com/threads/case-for-a-gibson-eb-2.577338/#post-10250565
As expected because the EB-2 is short scale and the JC is long scale there's a bit of a gap at the head end, but the body looks snug enough and the neck is still supported.
There are gigbags which fit such basses, but I would think that a hard case would be more appropriate for a older instrument like this, and I suspect that's how you feel also.