[spoilers for mostly Jurassic Park 3, some for The Lost World: Jurassic Park, and Jurassic World: Fallen Kingdom]
Billy: I was photographing the nest.
Actually, was he? Billy lies to Dr. Grant by omission about having taken two eggs from the raptor nests they stumbled upon, but what he says he was doing instead is a good lie. Why would he not have taken photos? ...Why did it not occur to anyone, possibly up until that lie, that they should photograph the nest while they're already there? Maybe Billy was the only one with a camera, and certainly getting out of the raptors' territory as quickly as they could was a good idea, Billy splitting from the group while in raptor territory being a lot less of a good idea, but... just a couple of snapshots on their way out? And did he actually take any in addition to stealing the eggs?