I’m not 100% sure, but I think what’s there is what they have managed to save from the camera they found on Zolotaryov’s body.
Personally I think it’s more likely that the camera is Tibo’s than that it is an unidentified camera that wasn’t found. The person who did the analysis on the website argued against it, but I find his arguments to be more of hand-waving away the evidence than persuasive proof. He’s trying to push a certain theory and so the supposed murderers took the camera. Why they didn’t take the other cameras or film, I wasn’t invested enough in his theory to find out.
Of course, the question comes up as to why Zolotaryov took it on that fateful night with a whatever it was bearing down on them. As you mentioned, several investigators believe that Tibo and Zolotaryov were outside the tent, which means they may have likely been the first to realize that something out of the ordinary was happening. There’s always been something of a puzzle with the flashlights, like the one on the tent and then there was supposed to be one with a dead battery. What Zolotaryov could have done, if he didn’t have a working flashlight, is grab the camera and use the flash to see what was going on. One of the pictures in the damaged film does show a bright flash with what looks to be the heads of three people at the bottom. Some use the photograph to bolster the UFO or rocket theory. I wouldn’t go that far because it could simply be overexposure. However, the most logical explanation, in my mind, is that he took a picture of the slope or sky above them to see what was going on, and, of course, he would still have had the camera with him when he and the others left the tent.
I don’t believe in Bigfoot, but I honestly have a hard time wondering why anyone would use that picture to argue the existence of Bigfoot. I have seen plenty of other pictures that look way more authentic. For one thing, there’s a hard line at the figure’s waist. So either Bigfoot only has fur from the waist down or his fur abruptly changes to a darker shade at his waist and heading downwards, or he’s wearing clothes where his trousers are a darker shade than the jacket he’s wearing …you know, like Tibo! Maybe he stole Tibo’s clothes. Also, he must have stolen Tibo’s skis as well, because there is a definite ski track going from the photographer right to the figure. Nice to know Bigfoot figured out how to ski.
Joking aside, I know the figure looks beefier than Tibo, but I’ve been hanging around conspiracy theories long enough and trying to figure out why a black dog would kill Kennedy and whether that’s the Loch Ness monster or a kid’s bath toy to know that you can’t always trust the proportions in a photograph, especially from an older camera. And some of the beefiness is definitely being caused by the fuzziness of the picture. I think it is more likely that Zolotaryov and Tibo might have been playing a joke on the other team members by staging this scene to look like a Bigfoot sighting. They were the fun-loving ones. That being the case, they could have even done something to make Tibo look more ape-shaped, like maybe stuffing clothes under his jacket or him putting on more layers of clothing.
I don’t know that I would have the talent to do it, but if you have certain information about the camera found on Zolotaryov, like focal lens and what not, you can figure the size of objects in the photograph, as well the photographer. Of course, that would only mean that it was the camera on Zolotaryov or a camera that had the same specifications. However, one good thing about Zolotaryov is that he was quite a bit taller than all the others, with the exception of Doroshenko. So having the camera specifications and putting in the calculations, if it turned out to be a large person, it could only be Zolotaryov, Doronshenko, or one of the others standing on something, like a tree stump. Probably, with at least one of the pictures, you could narrow it down even further just by the surroundings and the placement of other people in the group