The Sterling Subcontinent, where Xena Pus was currently staying, is also the eighth subcontinent Murphy had reached in his travels around the world. Of course, Murphy did not go sightseeing on this continent as his current focus was entirely on his campaigns in the exotic realms.
Retrieving the giant dragons he used to keep had ceased to be Murphy's concern, a task now assigned to his subordinates. The dragons now held little significance to his power; the search was once an obsession, but to do so personally would be a waste of his time.
Furthermore, Xena Pus's main purpose in arriving at the Sterling Subcontinent wasn't to visit the giant dragons once kept by Murphy, but to gather all dragons of the land, every pureblood member of the Dragon Race of any age or type, without exception.