An old thread, and Jen may not even be around anymore, but since this is a popular question in relation to Bigfoot, I'll resurrect it if nobody minds.
Why haven't we found a corpse of a Bigfoot? Well, you have to realize where the Sasquatch supposedly lives, in the woods, and quite often, in the very deep woods. As an experiment, take a piece of meat and leave it out in the woods, go back the next day. I can almost guarantee that that piece of meat will be gone.
I've been hunting for 25 years and time and again I've seen gut-piles disappear overnight. Literally overnight. I harvested a deer, dressed it out, and taken it home. I've gone back to the exact spot less than 12 hours later, and the entire gut-pile is gone and there's no sign of it.
Aside from the explanation that everything in the woods took a piece or a bite of a Sasquatch carcass, you also have natural decay. Of course it depends on the weather, the climate, and the type of soil in any given area, but anything left in the woods will decay. Now, if your talking about the Pacific NorthWest, and a Sasquatch expires deep in the woods, what are the chances that someone will stumble across the body?
There's is also the theory that the Sasquatch may eat their dead. It's not an uncommon thing actually. One of the biggest predators of immature bears, are adult bears.
For the amount of food that it would take to power such a large animal as a Sasquatch, I find it hard to understand why a body wouldn't be used as a form of sustenance.
Hope that answers your question Jen.