Leaving Food Around Non-Jews

Can I keep food in a work refrigerator if there are non-Jews there. In this case it’s in Tupperware and the container is kept in a plastic bag

A – Seal it and put something on it that will allow you to see if it was tampered with
Q – Thanks And if it was left without a sign is it not allowed at this point?
A – Its fine if they dereive no benefit by switching the kosher food for non-kosher food.