Ok this isnt really a secret but if you dont know yet the game has a little puzzle kind of thing well any way when ever you see the the Acta Non Verba symbol on an un-breakable piece of metal (as seen in mission NO.2 ACTA NON VERBA) scale the area for gold crates like if its leaning on a house its normally in that house (just like in GEARS OF WAR) also there is only one crate that is outside that i know of that is outside i cant remember the levels name but its the one where the bridge gets blown up when you get near it and have to cross it by foot on the side check out some FAQS to figure out