See this link:
https://www.radioreference.com/apps/db/?sid=5042 Scroll down to the talkgroup section for Florence County. In fact, there are more than 60 talkgroups for Florence County listed there.
I assume that you're specifically referring to Florence County Sheriff or other law enforcement talkgroups. There are indeed only 7 talkgroups listed for "Florence County LE". All law enforcement talkgroups for Florence County - Sheriff, Florence PD, and the other municipal PDs - are encrypted. Because of this, they cannot be indentified as far as their use. Which is why only a few are generically listed as Florence LE. I'm quite sure there are other talkgroups that are active, but they too are encrypted and cannot be identified.
There are no other systems or conventional channels in use that I am aware of.
If I have misunderstood your question, or not answered it adequately, please restate your question more specifially.