It sounds like their policy was to flag the footage of the incident (the 15 mins before until 5 mins after). They still have that part.

It seems like NTSB now wants all of it but they could have had it if they had done their job.

Its kind of funny because I was just watching some reruns of the first 48 with my wife the other day and the detectives on that show, no matter the department always go for video first thing from businesses, ring cameras, etc because they know it disappears the longer you wait. Why a federal agency investigating a major ecological disaster didnt do the same is beyond me.