I have the SOLUTION to your problem. Hide a camera in your office a video camera. Dont make a big deal about your old camera if its not to late. Leave your office and put like a old wallet or purse laying on your desk really obviouse leave like 20 bucks inside the wallet or old purse. Leave you office for a while or put a sign on your door that says will be back in 1 hour or something like that to give the criminal time. and let the video record, The first night or two nothing may happen, but after a few days something will happen, They will get gready. it takes time but eventually something will come up. UNDER NO SERCUMSTANCES DONT TELL ANYBODY THAT YOU WORK WITH ABOUT THIS!!! because with the word of mouth the subject who took your things might find out about this master plan. It may not be the cleaning crew. It could be someone you know in your job that doesnt like you. people who usually steal are people that know you and know what you have. you might be surpised on who it is. I have been doing this kind of work for 3 years, I work for target loss prevention.