Firearms, explosives, drugs, and other highly dangerous items are not kept in these lock boxes but quickly handed over to the police. This handgun was found at John Wayne just last week.
In 2011, the TSA at John Wayne confiscated 111 items that they deemed "extremely dangerous," according to Nico Melendez, the TSA Spokesman for California, Arizona, and Hawaii. In 2012, only 42 dangerous items were taken. These items are obviously not your travel lube that's over 3 oz., but things like firearms, flammables, explosives, fireworks, and sharp objects.
All images by LP Hastings, unless otherwise noted.