From what I've heard from other drivers, you were lucky that he just gave you the warning.
I don't drive more than 100 air miles from the shop so log books are not in my routine.
The MSP has been cracking down here on simple things. Most guys I talk to think it's to generate revenue for the state.
I heard of a driver in Ohio or Illinois that received a "notice" because a manifest was not signed properly by a client.