We are currently in Ajijic, driving a US plated car with TIP that expires in December. We plan to go north across the border for several weeks, returning until December when we will return north again (before the 180 days passes). When we reach the border going north, do we need to turn in any paperwork? Our plan is to start on the temporal/permanente process now in September. We asked on our southbound entry into Mexico and were told that we could just leave without turning anything in and then reenter, stopping to get the new "visa" marked canje when we return to Mexico. But I'm not sure if that is proper and hope someone can verify for us. Gracias.