wow bad situation man. That sucks. They had to have rummaged through your room looking for something to steal. Was anything else missing? unfortunately as you probably already know, money is most likely gone. Chances of you getting it back or any recourse on them is very slim.
I had similar situation, not with stolen cash but with stolen jewelry and other valuables (camera, laptop, cards, comics etc) Had let the girls friend and boyfriend (who we knew for years) stay with us for a few weeks. Which turned into few months, as it always seems to do. Noticed stuff was suddenly missing. I kept old comics and cards from when I was little in shoe boxes in the closet and some under the bed. Was looking for something else one day when I noticed the box looked open, stacks were very thin. I confronted them right away. Tossed them out and realized old laptop was also missing, digital camera gf's jewelry.... Took lots of restraint on my end to not make it physical. Just thinking about it makes me mad
Keep this thread updated though. Would to hear a happy ending here