How do we make our fridge museum say which food is actually shared?

My sister Maya opened the fridge and said, 'Who has interfered with the Forbidden Cheese?' I was standing beside her making a sandwich with it.

We share a flat and buy some food together. She has recently turned our fridge into a miniature museum. A tub of noodles is 'Untitled, mixed media'. The cheese had a handwritten card reading 'Forbidden Cheese, artist unknown'. Her birthday yoghurt was 'A Study in Self-Control'. The labels look good, and I made a tiny sign saying the vegetable drawer was closed for restoration.

I thought 'Forbidden' meant the cheese was especially tempting. She meant it was hers for a dish she wanted to make that evening. I offered to replace it, but she said I should have understood the sign. Earlier that week, she'd told me to help myself to a yoghurt with an equally dramatic title, so I hadn't treated the museum language as instructions.

We don't want separate shelves and a clipboard. Sharing groceries is convenient for us, and I like the labels. I also want to build a sandwich without interpreting a curator's intentions. Can I ask for a plain ownership line under each title, or should I just check with her every time something has a joke label?