Also keep an ear on 18505, I've seen almost all of their IDs on that channel at some point. It's likely their channel 2, but I never have a scanner listening. As soon as someone confirms the channel name I'll add it to the DB.
As for Mount Holly, I believe someone on here posted about it a while back, between narrowbanding, their UHF repeater taking a lightning strike, and already having plenty of 800 radios, they just went to 800 digital.