Anyone who has interested in museums and/or libraries for any length of
time can come up with a long list of damage and stolen items that
happened during construction. I know of one large art museum that had a
good security system-for example a computer kept track of who opened locks
in collection areas. But the museum did not assign folks to watch
construction workers who were removing walls. As a result they lost quite
a few objects, recovered most when a dealer alerted police when offered
some of the items for resale. I guess the point is security costs
including staff people on duty have to be built into construction costs.