* For starters: Why did the kids show themselves in daylight just before [[spoiler: the helicopter attack that killed two of them]]? By that time, they should have had it very clear that "showing oneself by daylight" equals "death."
** Truth in television. Insurgents in real life show themselves in daylight a lot, too. Often with similar results.
** Also they had learned a lot... to the point that living the way they needed to was becoming physically and emotionally exhausting. They basically reached the top of the competence curve and started rolling down it. This applies to the following question too... it's not that they don't know better, it's just that they've become too burned-out to listen to their own better judgment.
* Not to mention: Why weren't they a lot more suspicious about a bunch of food that just ''happens to'' fall off a truck right near where they're watching?
** Both questions are answered by the fact that they were damn near starving. They'd already run through the last food they had and were probably hesitant to do too much hunting for fear of alerting Soviets to their position, if there was indeed much of anything left for them to hunt. It was nearing the end of winter and by then their desperation simply won out.
** Doesn't explain why they didn't send ''one'' person to check out the box, instead of exposing their entire group to ambush.
*** Because 1) that means the leader either has to pick someone to go or has to go himself and make everyone wait, which at that point would have bred resentment, and 2) it wouldn't have mattered, the ambush didn't consist of a couple of guys waiting to jump out and go "A-''ha''!"