Possibly a college on the Gulf Coast? There is a 24020 that is Eunice City Marshal in St. Landry Parish Louisiana.
-USM on the Coast uses MSWIN (and a permanently emplaced SOW).
-MGCCC uses Harrison's EDACS as well as MSWIN and Jackson County's system.
-PRCC out in Hancock/PRC (as well as a campus in Hattiesburg) uses MSWIN.
-The only other college I know of is Blue Cliff which doesn't have radios and is in a single building.
I possess codeplugs from USM, MGCCC and PRCC; none of them contain this talkgroup.
Further, I've never seen a codeplug from a college or university that contains some of the talkgroups these RIDs go to, i.e. MBN, Pafford, MHP or DMR.
I'm at a loss for what this could be, and I've never had enough audio to determine anything.