I am going to share a story that is not meant to minimize the difficulty with guests "acquiring" stuff, @Sharion0, but just want to state sometimes hosts (by hosts I mean me) are dizzy as guests.
Early in my hosting experience, I had a college professor staying with me in my shared space listing for 2 weeks. He was a wonderful guest and stored a few things in my refridgerator. Well, I didn't realize he was storing the same brand of yogurt that I normally buy so I ate some cartons. Yup, ate his food. Later realized it and told him as I replaced the items. So embarrassing! Now I have a whole refridgerator for my guests in the garage. We all have a learning curve.
My point is there may be sometimes when the behavior is just the guest making assumptions due to lack of experience or inattentiveness. I think if the host messages the guest noting the missing items, most will be embarrassed. I think that helps the host community to help guests become more attentive about boundaries and expectations.