An epilogue... how awesome, I wasn't expecting that! I loved every sentence! One tiny thing you may want to alter is...
Jimmy smiled. “When I arrived in Christchurch, I had a night there before travelling west to Fiordland.
Fiordland is more
southwest of Christchurch than just west. There is no direct road access to Fiordland from the West Coast (Westland) even though they are on the same side of the island. Although I suppose he could always fly in by helicopter from the Haast / Jackson Bay area of South Westland.

But from Christchurch I'd imagine he'd travel to Te Anau before heading into the hills, etc.
Thank you for another great story. Looking forward to your next one.
Cheers
Elizabeth