A missing man whose foot was found floating in a Yellowstone hot pool had no suicide note in his car — though investigators have found his laptop computer, notebooks and handwritten poems, according to National Park Service documents released Tuesday.Yellowstone officials didn't immediately return an email message Tuesday asking about any new developments in the case.A park visitor was first to report the black shoe to a tour driver Aug. 16, although park officials earlier found two shoe soles - size 9 or 10 - in the pool Aug. 8 and 12, according to a park ranger's report released Tuesday.Inside, investigators found a variety of items including a wallet with his driver's license and $447, a photo album, notebooks and a book of poems with handwritten notes, according to the documents."Boiling water surges just under the thin crust of most geyser basins, and many people have been severely burned when they have broken through the fragile surface," the park said on its website."