bargle: I doubt this got muggled. If any person had anything to do with the disappearance, it was probably someone who likes to snatch cache containers. It probably just got washed away.
For those of you who never found this, I made it by decapitating a My Little Pony doll, putting a nalgene vial inside with the cap in the head and the vial in the body. Then the head would screw back down over the body. It was a pretty cool and creepy little container.