i went through koguruhn many years ago and pilfered everything now have come to quest and im unabpe to find the tomb of dagoth morin can anyone help me to add the tomb plus the artifacts needed the shadow shield and a cup marked dagoth

The shield is deep below the stronghold in Kogoruhn, Bleeding Heart (on an altar along the far east wall)
The cup is found in Kogoruhn, Dome of Pollock's Eve (the dome on top of the stronghold)

There is no place actually called "the tomb of Dagoth Morin." That's just a description of the caves under Kogoruhn.

If you have lost these objects long ago, you can use the console to add them to your inventory:
shadow_shield
misc_goblet_dagoth