Reid says that the body parts were found within a quarter mile radius, (actually they were spread in a quarter mile line leading to the wolf den) so it's most likely the pieces were scattered by wolves. Except wolves don't scatter bodies.
Even if Reid who has no real experience with wolves didn't know that their behaviour doesn't fit the theory, one of the locals (particularly the rangers) should have known better.
Wolf packs, like any other family, eat, sleep, and live together and don't waste precious energy dragging heavy carcasses around. (And they don't do doggybags.) If the body parts had been dumped together that's how they would have been found.
The name of the newspaper Reid presented to Rossi was titled "Rapid City Sentinel." The actual name of Rapid City's newspaper is "The Rapid City Journal." However, it is common in works of fiction for there to be fictional publications, such as newspapers. It is a choice, not an error, when this device is used.