Actions triggered by the result of the search for $UNKNOWN are:

If

No items with the $UNKNOWN item type are in the source region.

Then

A message is logged warning the user.

If

The source region is a disperse region.

Then

Only the item with the $UNKNOWN item type will move.

If:

Multiple items exist at a location and the source region is not a disperse region.

Actions triggered by the handling of a moved item are:

If

Not handled along the route

Then

The item moves and a message is logged warning the user.

If

Not allowed in the destination region

Then

The item is deleted and a message is logged warning the user.

Transitions.