He's left valuable stuff before. He left his wallet and a crack pipe in a rental car that he returned. Some people are just forgetful.

Aside from the leak, it's also not the loss that it would be for most of us. He's rich. He had some sort of iCloud backup thing (sorry not a Mac user) to restore all the data, so he wasn't missing anything. Picking up an old laptop wouldn't be worthwhile if a replacement arrived before the old one was repaired.