We have security cameras in our office, and I still don't trust leaving my iphone alone on my desk when I slip out for a moment.
If you haven't tried it already, you should really call ATT and explain your dilemma. Ask them to give you the list of numbers made on the phone for that day, and thereafter for as long as they have record of while the culprit was still using your SIM.
That should provide quite a bit of information as to who it may have been if it was indeed someone in your office, or at least give you people to shake down letting them know you're following a trail back to your iphone.
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