Just throwing this out there just for the heck of it; maybe relatives came in from Australia and he went there to pick them up!
I thought LE has three passports?
Interesting theory. I'd like to know if he had purchased a ticket, or was picking up a relative. Reminds me of the british bloke who killed his wife and child, then fled back to the UK. He was finally brought back to the US. Gosh, I can't remember his name (the coffee hasn't kicked in yet).
Mel