Parcels are not touched, for good reason
A parcel belongs to a resident and often has a delivery record attached to it. Moving one to reach the floor can put it where the addressee will not look, and if it then goes missing the last person known to have handled it is the cleaner. That is an unnecessary exposure for a task that adds very little. Delivery photographs taken at the shelf position add to the problem if a parcel has since moved.
So the rule is absolute: parcels are not moved, stacked, sorted or repositioned. The floor that is exposed is cleaned, the shelving edges and the door area are cleaned, and anything else is reported. Building managers generally support this immediately once the reasoning is explained, because they have usually dealt with a missing parcel before. It is one of the few rules that protects the crew as much as the client.
