For everyone monitoring Duke sites in NC/SC, you might want to periodically monitor those sites to see if new neighbors (peers) pop up. Seems like they are building out pretty quickly and that some sites previously not reporting any peers or just a few peers have been showing more peers.
NOTE: Be careful about what you find in the DSDPlus.P25data file. It will only get added to, and DSDPlus will never remove anything from it [to my knowledge]. And that means that for new systems being built out, some data reported by control channels is not correct or is only temporary but DSDPlus.P25data will keep it forever. So if you do some DSDPlus sleuthing specifically for Duke sites, it might be beneficial to back up your DSDPlus.P25data file, then remove/rename it, restart DSDPlus so that you know that whatever populates in there is the most current information.
Any chance you could post [verbatim] the info from your DSDPlus.P25data file for 3D4-67.67 and 3D4-23.23. copying/pasting straight from the P25data file without massaging is avoids any possibility of a transposition mistake. Each site has its own stanza in the P25data file.
And were these picked up during a tropo event or are you able to pick them up regularly? I ask because if you are able to pick them up regularly, they might have some changes/additions since the last time you copied them.