Back to the original post, we have gotten into the habit of crossing southbound ( to San Felipe ) at San Luis because we are not questioned about anything other than registrations for all the vehicles which I have ready access to.
North-east bound we go on to Sonoyta because there is room to stop and get our fmm's canceled and at secondary I explained to the agent when anyone leaves the campo where we stay everyone else gets free stuff that we know are not allowed to bring back to the U S. She said, " Oh, I wish everyone would do that. It would make my job so much easier."
We were there for a total of maybe 5 minutes.