Office Mystery

Permanently Closed - Monday. Everyone in the company starts their day as standard, drinking coffee and having breakfast. However, one of your colleagues did not show up for work today. You decide to call him on his cell phone and suddenly you hear a ringing sound coming from his office. You open the office door and notice that the computer is left on, and there are some strange objects around his desk... Will you be able to find all the clues and find out what happened to the missing colleague?