We learn in Harry Potter and the Cursed Child that apparently:
the Malfoys had a time-turner all along.
So why did Draco spend 30 chapters in Book 6 fixing a cabinet when Lucius could have given it to Voldemort in one chapter in Book 4?
Voldemort had no qualms making Horcruxes; he could not have been squeamish about using this to undo Book 1.
The Malfoys were out of their wits trying to save Draco from the task assigned to him by Voldemort. Lucius was desperate to get back into the good graces of Voldemort. The Malfoys had every reason to hand the device over to Voldemort. It is rather lame of Cursed Child to say that Lucius regarded the item as a toy rather than a weapon.