To search just StandaloneTables within the map container for the matching URI and not include StandaloneTables within group layers (within the map), use StandaloneTables
// these routines find a standalone table whether it is a child of the Map or a GroupLayer
var tblFind = aMap.FindStandaloneTable("CIMPATH=map/address_audit.xml");
IReadOnlyList<StandaloneTable> tables = aMap.FindStandaloneTables("addresses");
// this method finds a standalone table as a child of the map only
var table = aMap.StandaloneTables.FirstOrDefault(t => t.Name == "Addresses");