There are a number of strange things about this story:
1) What possible justification did the tribe have for seizing the aircraft other than "because we can" and "we feel like being pricks"?
2) The FAA actually interceded here? In a positive and helpful way?
3) A joe-citizen actually got the department of justice to A) pay attention and B) actually do something useful?
4) He actually got his plane back?
After dealing we many/all of these entities (well, not the tribes), I can report that this story is basically non-believable.