The guards like to stay away from the explosive cargo for reasons seemingly unknown. While you are prying open boxes and looting, you manage to find most of the more expensive alchemical ingredients. One such remains for now, while digging through the more covered and pushed back crates. Which makes things rather more interesting, as you pry open one crate to not find bottles, but a long slender chest suspended by magic in the crate, the only thing in it. The magic there for packaging.