Moving into a house with some stuff of the old owner

Q: I have moved into a new home. The previous owner was not Muslim. He had left some baking trays that fit into the oven that he left here which I presume he was not using. I am not sure if he would have cooked any haraam food with the trays. I wanted to throw his trays away but now some of my baking trays were placed in the same draw and they got mixed up so I don't know which are mine and which are his. Is it fine if I end up using the dishes that he used to cook with as long as its washed with sunlight and water?