To nitpick a bit, it isnt really that important that the orbs be made by mexicans, or even humans for that matter. Just like I cant go into mexico and mine for precious metals without permission, you cant take anything in their claimed territory from artifacts to oil to the fish in their territorial waters. If they can prove the orbs came from within their borders, they have a legit claim on them. But yeah, proving they have a claim is going to be harder. First they have to figure out sydney was there instead of the florida keys which IS a possibility. Then they have to have some sort of evidence the orbs were there before she came along, which would be a lot harder, probably requiring they find some more alien stuff in the general vicinity. then they could make a reasonable case. "We have records of sydney going scuba diving in our waters, and in the same general area we found a half buried alien temple with an altar that had indents for spheres matching hers in size and numbers. "