Reheating Food

Today I put some leftovers from a restaurant into the oven to reheat them. They were in an aluminum pan with a paper lid. There were no instructions on the lid and I couldn't remember if you could put the paper lid into the oven or not, so I did. Five minutes later smoke was seen streaming from the oven and the flaming lid had to be removed... No, you can't put that paper lid in the oven.