I thought most cars came with two keys? What do you make of no blood in the car yet the body of Urban found 70km away from where he was last sighted? Do you think Heidi's body is nearby but as yet undiscovered?
2 keys as in 2 for the ignition, or one for the doors & one for the ignition? I've always bought old cars offen with the one key, other key broken or lost.
Heidi's body could be anywhere. The low life(s)that commited this crime would have wanted Urban out of the way first, so they could have their depraved way with her.
With Urban's skeletal remains being together, probably discounts wild pigs devouring and scattering the body parts. It's possible this is what happened to Heidi's body.
The fact that Urban's body was 70ks away with no traces of blood in the car would discount Tamihere driving it the 70ks.
Plus he would have taken Urban's watch.
Also while he's transporting Urban's body where is Heidi. Is her body also in the car ? Which would require to differing drop off points.
In one of those videos you posted, there were 2 sightings of the Swedes further up (north) in the Coromandel. Need to match the dates of those sightings with the date Tamihere stole the car.
This would also bring into question wether the Swedes were abducted, hitch hiking back to their car if these sightings were later.