>Stop assuming so much. If this were a quest, you'd have gotten killed already.
Adun, is that you?
More on topic, while the group /may/ have been from 2014, it may also have simply been from earlier in Earths timeline, but only gotten the camera (or the ability to use it) later, after they'd been here a while. After all, there were only 10 people in the pictures: maybe there were 11 people originally, and the missing one was the one who had the camera but they didn't meet the others, just had it recovered off their corpse/looters. Alternatively, it may have been out of power (I know my digital camera probably is), and they only got a way to charge it later, or repair it/the card, or any number of other possibilities.
It would help to guess if we knew whether the earlier pictures (marked 2014) actually were from "here," or from Earth. Similarly, whether the people in the photos looked like they'd been here a while, and if they looked like they'd been here for long in the church construction pictures (if they still looked "Earth-y," they probably hadn't had time to get church construction set up).
While I agree with the earlier viewpoint that it seems unlikely they would leave a valuable bit of equipment like that card lying around in some shitty hole somewhere on the off chance it would be found, it's possible they managed to replicate it, similar to how the bullets were replicated. On that note, replicating the card before putting it back would have been a good idea, but even the Psion can't think of everything... Of course, it is still possible that whatever dragged the journalists group here planted that card. Note that that doesn't exclude the possibility it was left there by a previous group.