Another ethics question

[Dr. StrangeloveX]

A couple years ago my dad canceled his garbage service. Somebody must have screwed up and didn't tell the actual garbage men that he was no longer paying for the service, because they continued to pick up his garbage free of charge.

So a couple days ago one of the garbage people comes up to my dad and says, 'Hey, I've checked the list a bunch of times and I can't seem to find your name...'

My dad says, 'Ya know, you guys have been stealing my garbage for a couple years now. I didn't notify your office because I didn't want to get you in trouble.'

They both have a good laugh.

So the question is: Is this stealing?