Stuck in closet for 2 days!

My husband and I needed to leave town fairly quickly and decided that our cat would be fine for two days. We left several bowls of water and several bowls of food for him to have while we were gone. When we returned on Sunday afternoon, we discovered that the cat had been in our closet when we grabbed our overnight bags and shut the door! He had been in the closet the entire time. Amazingly, he did not use the bathroom anywhere! How could he have gone that long without using the bathroom? I felt so bad. Has this ever happened to you?