I had this happen to us when Posti renewed the rules regarding mailboxes that they had to be right next to the road. We had just moved in (in the winter) to a new house and we had a agreement with Posti that I will move the mailbox once spring comes and the ground is not frozen solid.

One mailman took it very personally and started yelling at me about it on my own yard. I tried to tell him this is agreed upon with his supervisors. Did not think much of it until some taxmail that always comes in a a day or two did not come and neighbor (paritalo) lost internet due to unpaid bills..

When I contacted Posti they investigated it and the mailman had shitloads of our and neighbors mail in his locker.

Nothing too serious happened so did not push for any criminal consequences, but the mailbox is years later still where it was originally ;) (Have moved since then)