The cage door is the boundary and it is absolute
A storage cage is private property inside a common area, and its contents belong to a household that has no relationship with the cleaning contractor. Entering one, even to retrieve something that has fallen or to clean a floor that is visibly dirty, is not acceptable. The rule has to be absolute so that it is easy to apply and impossible to misunderstand. It also protects the crew from any suggestion that something went missing.
That is straightforward when a cage is locked and less obvious when one has been left open. The instruction is the same either way: the aisle side of the mesh is cleaned, nothing beyond it is touched, and an open or damaged cage is reported to the building manager. A cage left open is usually an oversight the owner would want to know about. The same applies to a cage with a broken latch or a missing panel.
