<snip>I always hate when I find non-kosher products mixed with the Kosher ones in the store.
There are 2 situations where kosher food is very directly mixed with a creature that is not kosher to eat. And the food is fine
1. A Bee (his honey)
2. A mother (her milk)
So really. If a sealed container of kosher food is next to a treif one, it's fine.
And fruits have contact with mud.. Mud doesn't come with a chechsher.
I would be wary about contact with non kosher food, (except perhaps the case of a bee and a mother)
But you're not even talking about contact, you are talking about sealed containers.
I sometimes put a bit of paper down on a desk - as a plate, and eat off a desk that people must have eaten non-kosher food on.