Seifert was in action again early on, swallowing a nick by CD's Dane Cleaver, that had rebounded off ND's second slip and popped easily to the keeper.
de Grandhomme finished with a miserly 3-13 off 12 overs, rounding out his 164 not out for a Man of the Match performance.
Randell was impressive, jagging the ball back into the CD right handers and grabbing the key wickets of Brad Schmulian (7) and Doug Bracewell (0) for LBW en route to 6-45.
Bracewell lingered at the crease, contemplating the height and movement Randell had extracted from the McLean Park wicket seconds earlier.
He eventually left, and is understood to be drafting a polite submission to NZ Cricket for the introduction of umpire reviews at Plunket Shield level.
From there on, the CD tail was unable to wag, but there were positives in the grit and tenacity showed by Joey Field who lasted longer than his top order batters as he and Ray Toole clung on.
The day eventually finished at 5.44pm when Jeet Raval trapped Field in front for 12, off an admirable 91 balls.
CD were all out for 82 in the 52nd over. The side will be disappointed after taking a first innings lead after removing ND out for 172 in the first innings, and making 249 in response.
ND's second innings was dominated by de Grandhomme match-winning century.
For CD, Toole had shone with 6-54 off 22.4 overs.