I fly maybe two or three times a year, not much, but I still see people hastily move their luggage around. I've had to do so myself, and while I rarely travel with a firearm, there are always a few knives in my checked baggage. I could see someone not remembering what bag has what if they packed it all the night before, but the gun wasn't even in the right travel case. They make it sound like he had no intention of even packing the gun. Seems odd to me.
"Today is victory over yourself of yesterday; tomorrow is your victory over lesser men." - Miyamoto Musashi
[Insert random irrelevant religious quote here]