DMH-Online

NWScript:

void CreateMe( location lLocation )
{
    CreateObject( OBJECT_TYPE_PLACEABLE, "chest005", lLocation, TRUE );
}
void main()
{
    float fSeconds = 4.0; //box respawn time
    location lLocation = GetLocation( OBJECT_SELF );
    AssignCommand( GetArea( OBJECT_SELF ), DelayCommand (fSeconds, CreateMe( lLocation ) ) );

  int nDiceRoll = d4(1);
  if(nDiceRoll == 1)
    {
    CreateItemOnObject("item1", OBJECT_SELF, 1);
    }
  else if(nDiceRoll == 2)
    {
    CreateItemOnObject("item2", OBJECT_SELF, 1);
    }
   else if(nDiceRoll == 3)
    {
    CreateItemOnObject("item3", OBJECT_SELF, 1);
    }
   else if(nDiceRoll == 4)
    {
    CreateItemOnObject("item4", OBJECT_SELF, 1);
    }
}

good luck