I’m staying at a rented condo and heated up some chicken in the oven here. I triple wrapped the chicken in foil because the oven is non-kosher. In any event, after we had eaten we noticed there was a non-kosher pot on the top shelf of the oven that we had not noticed (the chicken was heated in foil with the pot in the oven). Obviously, we have already eaten so there is nothing to be done, but I was curious if there are there any kashrut issues or was it fine because everything was triple wrapped in the first place.
From what you are describing it seems alright.