"Most of the risks in the category of thieves, vandals,
and displacers are traditionally covered by museum security services
in large institutions. Thieves obviously are a great concern because
museum objects have a high value, their location and existence
are well known, and if an object is stolen the loss is total.
Vandals tend to attack high-profile or noticeable items, and often
inflict severe damage. The agent "displacers" addresses
the problem of artifacts that are misplaced within the museum;
this is usually done inadvertently by staff members in storage
areas. If an artifact or specimen has been misplaced and cannot
be found, the effect is the same as a theft."
Costain, Charlie. Framework
for Preservation of Museum Collections, Canadian