In the rule entitled Collections, change the text “Artefacts in Collections are never considered to share a Location with any other Individuals or Artefacts” to read

Artefacts in Collections are never considered to share a Location with any other Individuals or Artefacts, except those Artefacts which are in the same Collection.

To the end of the same rule, add the following:

If an Individual ever ceases to be a Collector then all of the Artefacts in their Collection have their Locations set to Public Places at random.