code: def copies(self):
          
          import nitrate
          if self._copies is None:
              log.info(u"Searching for cases copied by {0}".format(self.user))
              self._copies = [
                  case for case in nitrate.TestCase.search(
                      author__email=self.user.email,
                      create_date__gt=str(self.options.since),
                      create_date__lt=str(self.options.until),
                      tag__name=TEST_CASE_COPY_TAG)]
          return self._copies
docs: All test case copies created by the user