Jack makes it clear he would rather stab something to death than process the avalanche of paperwork needed to release the confiscated freight. Also any legit courier would have the pickup forms ready to go. In spite of how he's supposed to be dressed now but isn't, he ain't nobody's fool.
Author commentary: Don't worry, PM, it's fine. Jack pulls out a blade of some sort pretty much any time someone comes into his office, or just enters his vicinity in general. It's like saying hello. The fact that you aren't dead already means he likes you.