Well in this case it's pretty obvious that it is fradulent and the money should not have been sent, and it could be a one time thing since it is 0.3% of all the currency.
If the computer was owned by a company how are you determining that this was not a legitimate transaction initiated by the IT department? This guy effectively gave all his bitcoins to his company (by putting them on a work computer) and is mad that someone else within the company accessed company resources.
You're (probably unknowingly) spreading misinformation. I never put them on a work computer. It was my home PC. Sitting my damn house.