The difference you are speaking to here is one of intent.Greatest post, ever! I got a good laugh when I read that last night.
On a side note - all this bickering to some extent is splitting hairs. Some people make no distinction over taking a ball point pen, others think you can take more before it is theft. But lets be realistic here: Who has never walked away with someone else's pen? Gosh, better lock me up, I accidently walked away with a pen, or printed out a map from google maps from my work computer.
What these guys did was wrong. They took property that was not theirs and sold it. Not sure how anyone can defend that...
You do not intend to steal the pen, it was an error, an oversight.
Walking into the company stockroom and pocketing a box of pens for the sole purpose of taking them home for personal use is a very different matter because of the intent.