Completing the paperwork with Customs in Mexico to cross your American car is completely free. I certify that I, or the firm, company, or corporation I am authorized to represent, am the legal owner within the meaning of California Vehicle Code.That's called theft. It's against the law. It is your group's responsibility to provide transportation across the border as well as within Mexico. Amor, if requested, can contract in-country. Vehicle repossession is complete when the repossessor gains entry to the vehicle or when the vehicle is hooked up to a tow truck. To do this, you will have to print off a request form, fill it out, and take it to your nearest county tag agent. To do this, you will have to print off a request form, fill it out, and take it to your nearest county tag agent. Complete all fields with your travel information. 5.