The definition of griefing

[Rathrok]

2) Griefing

Generally, “griefing” is anything you do that interrupts another player’s game experience. It can be as simple as ruining an RP experience or to destroying another player’s building for no valid reason. The extent of claimed griefing will be up for interpretation by the staff members.

this is contradictory, if creator was to replace the blocks he had broken, it would have ruined the RP experience for him. If he's going to be a looting and plundering pirate, you wouldn't exactly make sure everything was clean and spotless before you left...