As far as the 911 tape, you also outline a scenario that can suggest the family wants the tape for all the wrong reasons
I don't doubt your family's good intentions. A decision can't be made based on what the family plans to do with the information and how well they will guard it.
The state has the liability and responsibility to the Oregon family's need/right for privacy and to feel safe.
Montana Highway Patrol, what reason would they have to invent receiving a 911 call, dispatching a Trooper, and having him meet with a family at the river? For what purpose would they commit felonies, risk their pensions, and go to prison?
Isn't it more likely that the 911 tape is real but wasn't released due to the Oregon family's rights?
I am in the United States. In my state, I've never seen or heard of a report issued with that kind of title. If it's not known for a fact that this is a practice with that dept, I wouldn't assume that you aren't getting something that you should.