154.680, 155.460 and others are still maintained and used by the ISP for various activities. 155.460 is the statewide ISP "HF4", installed in every car and ISP Post. It is used for Post to Post type activities within the ISP, for car to car, and as kind of an itinerant channel for the ISP. Occasionally aircraft or ground speed enforcement details are heard here as well.
154.680 and the other HF3 channels thruout the state (such as 154.695, 154.935, 155.520 etc.) are retained by the Posts from before they switched to StarCom21. They are not normally used for regular dispatch unless there is some issue with StarCom21, such as a site or the system being down, a specific unit's radio being down or someone working in an area with known coverage issues. Occasionally ISP Posts will multi-select HF-3 and a StarCom21 talkgroup so you will hear the dispatcher on both.
67.0 PL has been installed on most VHF base stations thruout the ISP on most VHF channels. Before StarCom21 most of these base stations transmitted in CSQ, so we can presume that this was done as part of the StarCom21 project, perhaps to trigger patches when enabled. AFAIK the mobiles have not been programmed to transmit this PL, at least I haven't seen it around here.