The aircraft log book always goes with the aircraft as well as your logbook, at least that has always been my understanding. For instance I fly into an airport and the FAA wants to know when the last annual was done and I don't have the logs, guess what, aircraft gets grounded until confirmation.
To be honest I don't know what 107 regs are.
I assumed someone complained about my operations there and he came out in response. He found nothing wrong and was very pleasant person. His request for the logs may have been nothing more than wanting to see if I was keeping them up to date. I showed him both of my licenses.
I didn't ask him what prompted the visit, my schedule there is very well known.
I now have permission to overfly parts of the active college, but at scheduled times and only with an OP. The college supplies the OP from their drone department. That alone may have prompted the visit.