The longer this goes on, the more inclined I am to believe that this was plannned and executed with a lot of rehearsal. That he had a place to dispose of the body before he murdered her, and that it is either underground or underwater or under a building that has not been on the radar. or else it would have been exposed by now. I think it's fair to say the body is not out in the open. And not near any horse farms, either, horses are particularly sensitive to (a) strangers in their paddock and (b) strange bodies in their paddocks ...
So either he is extremely lucky, or he planned and meticulously processed this whole matter, over and over again to get it right. There is, apparently, not much of any other sort of scenario, really...
However, VICPOL have gone toe to toe with other murderers of the same mind set, and eventually justice prevailed. Of the capacity of VICPOL to find the body, I have no doubt that they will. People are convicted of murder without a body, it happens , not a lot, but it happens enough to be comfortable with that outcome.
It is just as apparent that he has made one, or possibly more than one colossal , monumental error, or errors, because there he sits, under arrest for murder, so somewhere he has slipped up, either by talking, ( 3 can keep a secret , if 2 are dead , Benjamin Franklin) or he has been overcome with his own 'artwork' and filmed the entire thing and sent it on, I do think VICPOL are smarter than him. on any day of the week. VICPOL know the error he has made, which is why they are in no doubt that she is not only dead, but murdered, a double down of irreversible claims that VICPOL does not usually engage in.