Gabe;
I was advised that if I did not surrender that bit of paper on exit from the US there would be problems on re entry.I ended going to the US embassy in Panama,was given a form to fill in and had to post it back to the US registered mail.Perhaps you could obtain one of these forms and post it back when you venture down to Mexico.As you say there is no where to hand it in as you exit from the US.
Ben
 How about waiting until late July and I could join you riding down to Copper Canyon.
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