Phones.
Chargers.
Jewellery.
Clothes.
Keys.
Documents.
Children's toys.
Occasionally, things far stranger, most hotels have procedures for lost property.
Someone finds it.
Someone records it.
Someone stores it.
Then there is the question nobody thinks about:
How long do you keep something that nobody comes back for?
A forgotten object can sit in a hotel long after the person who lost it has completely forgotten that they ever owned it, a hotel isn't just temporarily holding people's rooms, It's temporarily holding fragments of their lives.