@ beerhunter. You have hit the proverbial nail on the head. The biggest problem is knowing where to look. If bigfoot is as reclusive as reported, that could be in some very hard to reach, out of the way places. I know from experience that most people don't stray very far off the beaten path. On top of that you have to be paying attention and know what your are looking for.
@ Crowlogic. No excuses, no special dispensation. I speak from over 40 years of outdoor experience. Other than ungulates (elk, deer, cows) and small game (grouse, rabbits), apex predator bones are very hard to come by. I came across a busted up coyote skull once. Also found a cougar someone had killed and placed on an old tire in a firepit, just plain weird. Some of the bones were so covered with moss and forest litter it was just a coincidence I kicked them out of the ground. I keep my eyes open and have made myself knowledgeable about bones. This is something that I hope everyone that is interested would do that spends time in the woods. Considering where most people go it's statistically more likely to find human bones. I know this possibility will deter some people but not everyone.
@roguefooter. As far as excavation sites go they are usually close to human habitations. Sure we are ever expanding outward, but the places where we are now are the places humans have lived for hundreds or even thousands of years. Places I might add where a sasquatch might visit, but not places they will be hanging around. Can you honestly say that every time a bone is uncovered all construction stops? How many times have they possibly been there and were missed? Archeologists dig in spots of known human habitations. This is not a likely place to look for the bones of a reclusive creature. A creature I might add that is doing the eating rather than being something on the menu.