ZERO
I LOVE Expedition Bigfoot!! I've watched all 6 seasons several times.
They do have plenty of things they find, but it depends what you consider to be proof. Seems to vary a lot for people.
It's as if some need to see one captured and dissected on a table. I'm not one of those people. I'd hate for one to be caught as it would get mistreated, probed, dissected.
What they find are hair samples, footprints, handprints -one of which was on the window of their command centre's door- plenty of thermal footage of a huge bipedal creature walking through the woods, sounds, proof that there's a creature that produces infrasound which is not done by any animal in the US and so on and so forth.
They do have footage of Russell -one of the team- catching a huge dark creature standing up and walking away, and it's clearly not a bear.
In the last season they capture a tall bipedal walking off through the woods.
They also find nests several times (on the ground), woven and made exactly the same way gorillas make their nests.
They try to back everything up by facts and science as much as possible. It's not like "finding bigfoot" which is a joke compared to this.
For instance, they have reason to believe that bigfoot can cloak itself and visually disappear right in front of your face.
Then people think, utter BS. But... a scientist/expert they visit says that we can actually make things invisible. We know how to do that. So it isn't a mystery anymore at all. He also says it isn't far-fetched to think that -if they can do it- an animal/creature could have figured it out too.
It's nothing more than bending light. So if a creature could move its hair a certain way for instance, it is not unthinkable it can make itself invisible that way.
They investigated that as there are tons of witness report stating that bigfoot suddenly disappeared AND because they themselves captured bigfoot on Lidar footage 3 times (!!) while there wasn't anything to see with the naked eye nor on regular camera.
So they captured a helluva lot! And you know, if you see how freaking fast these bigfoot move through the woods when they got one on thermal imaging it's no wonder hardly anyone ever has a close encounter!
NO human could run that fast. It's insane.
If the subject interests you this is really a great series!
I hear ya.. I wouldn't want any species to be prodded and poked (having had the medical profession do that to me for several years when I was very young..) OR dissected..

so I guess you're right.. being invisible may well be a very good thing..
I have a general understanding of the science of bending light aka refraction.. I've known of 1 person who could do this using their mind.. powerful stuff! "now you see me.. now you don't" is more than just magic or a movie title
I haven't had a chance yet to watch any episodes but I did look to see if I could find any.. only found 3 ep.. I'd have to watch them on YouTube..