offering up other possibilites within a free association is Not in my opinion presentation of a THEORY
Having said that..my knowledge of the employement of Protcuilli in Early Dynastic and Old Kingdom Royal Tombs is that they were meant to stay closed.
As far as maintenance goes...Maintenance of what?
The body (presumably) would have been mummified
the organs (I cease entering presumably in each of these) would have been placed in their canopic jars
the grave goods , food , drink, chairs, chariots whatever, would have been in place
and maids were part of the Grave Goods see Ustabi's
association on these boards is the broad
misconception that what we do not know is more
significant than what we do know."
Warwick L Nixon, March 8, 2019