The engagement ring
Spoiler for 10/16 episode.
The charge nurse returned the engagement ring to Deeks in some sort of protective container. So what does Deeks do? He takes it out of the container and sticks the ring--the valuable, diamond engagement ring-- into his jeans pocket. Yeah, that's the way to transport expensive jewelry: just stick it in your pants pocket with your car keys and tissue and pocket-knife. That's safe, right??
It's even worse than McGee, on the mother-ship show, asking one of his co-workers to hold onto the diamond ring he's going to give to Delilah.