Testing with the 'A' and 'K' sysFindObject criteria in unvFindObject doesn't seem to alter the list of stations returned with (unvFindObject "t+unid:0x12345678") format code.
Checking for property 'abandoned didn't affect the list either.

I have no idea if it is possible but it would be handy if unvFindObject could return a list of only active stations, ie excluding stations that have been destroyed.