@GF
I don't know if the MSP CBP location is noted in any reference material...I've never seen it noted anyway. I only found out because prior to departure I always ask both the FBO and the CBP agent on the phone where the meeting spot is.
Come to think of it KTUS, KBOI, KDLH and KINL are some others I have used where you are expected to meet at an inspection site far from any FBO. Always good to check with the FBO during trip planning.