No way this wasn't an inside job! Who else would have access to the manifest?
This type of heist is always an inside job. Who would go to the trouble of putting together an armed commando and taking a huge risk (or maybe not, as no shots at all were actually fired from the other side
) by forcefully penetrating a secure area, only to most likely find the hold filled with common, worthless luggage? Lots of people employed in security firms who would gladly sell out for just a (relatively) small chunk out of a 50million+ loot.