While Jeff County & Beaumont don't show a number of talkgroups on the new system (SETRRS P25) as yet, if the move is very recent, then probably no one, as yet, has submitted updates (or just not posted yet if updates were recently submitted).
I would suggest that you use the new system:
Southeast Texas Regional Radio System (SETRRS) (P25) Trunking System Profile
www.radioreference.com
Then scan that system in ID Search mode (for Uniden scanners), which will pick up talkgroups that are being used, but that are not yet listed in the database. On the GRE/Whistler scanners (including those sold using a RadioShack label), add a group wildcard to look for new TGIDs.
I do see Beaumont Fire, as well as one Beaumont PD, TGID on the P25 system. It appears that the new talkgroups being found are the old, Moto Type II, talkgroups divided by 16. Look at Beaumont FD Channel 1 Dispatch
On the old system, it is TGID 16016.
On the new system, the talkgroup is 1001, which is 16016 divided by 16.
You can either set the system to use ID Search until the new talkgroups are submitted & posted to the database, or manually create the suspected new talkgroups by the method suggested.