Lorrain where are you now. There are several crossing where customs and immigration a a distance apart and immigration will not ask for the customs paperwork. The crossing southwest of Uyuni by the geysers and pink flamingoes is one. Aduana is about 50k before the border at 5000 meters above sea level. You also need to drive almost one hour off the main track to get there. Once there all the guy did was take the customs paperwork. No stamp, no copy machine. We took pictures of us with him and the forms just in case but no one ever asked at immigration. This is route has lots of deep sand- fyi.
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