IMO these are all strong possibilities. I think Vicpol probably have video and possibly audio footage from several different sources leading up to the murder, the murder, and after the murder.
A lot depends on how much planning (if any) had been undertaken by PS prior to the murder - also how "switched on" he was at the time, ie whether he was still recovering from his bender the previous evening, or was he quite clear-headed.
IMO he was probably aware (even if still a bit brain-fuzzy from the bender) of the static CCTV's with cameras on a pole.
He may not however, have given a thought to (usually) portable cameras used to monitor fauna activity (either community -based, such as Friends of the Forest or for research purposes. The latter can be very well-hidden - even camouflaged.
I'm also wondering if CCTV inside a building (eg PS's father's workshop) may be included in the cache of eviidence.
JM