He does, indeed, have a record on our SMP server. Moved to SMP Ban Appeals
As for the reason of your ban:
It appears as though that you have triggered one of our grieftraps. It takes at least 5 destroyed blocks for it to trigger a ban-- otherwise, any less and it does nothing, so the classical "
1- or 2-block grief" will not work as an excuse in this case.
It should serve as a warning that you should think twice before modifying structures that you did not create. Why did you decide to continue?
If you have a good reason for this, I may consider lowering the ban, but NO LESS. You are still at fault for griefing in the first place, and the grieftraps do not catch false positives.