You should not go through peoples things without asking.
Ned is at work sitting in one of his coworkers offices.
Ned wants a pen.
Ned finds his coworker and asks him for an ink pen.
Ned starts to dig in the person's desk to try to find a pen.
Ned's coworker comes back to his office and finds a pen for Ned to use.
Ned's coworker is upset at the invasion of privacy and reports him to their boss.