The hospital wouldn't know what to test for, beyond obvious skin or metabolic signatures. Iirc, they said he was exhausted and dehydrated (although not as dry as he should have been, given the length of his "missing time").
Again iirc, there was nothing that Travis said about his experience that would have led anyone to think that there should have been physical traces. Nothing intrusive was done aboard the craft, and the craft did not land, blow dust around, or scorch the forest floor.
There's nothing in the story as reported that would point to any expectation of physical evidence.
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