Not so sure I want to know. Even as stills, very fuzzy since it was shot from a moving helicopter.
About 1:05 there are two black items in the water. If you just let it run and keep backing up so it's a bit crisper than with a still, the item to left also has some white in it. No clue at all.
The item to the right, as the helicopter comes around, looks to me like a barrel, or some huge black conduit of some kind. Round (tubular), with what appears to be an opening at the end (facing shore).
I guess I had assumed she was found just lying on the ground, but perhaps her body was stuffed inside a barrel (sorry to be graphic) and shoved into the water, without a thought, that hey, it might eventually float? Or the water level receded enough to leave it exposed by Wed the 25th.
At the opening of the video, I can't tell at all. Too much camera movement.
Suffice to say might be removal of items related to her murder, if not the actual body. Could be her body had already been found and they were searching the muck for further evidence and bringing up whatever junk had been dumped in there.
MOO