LapSap
Good try but the letters are very small in comparison to the wing, so the damage is not consistent with a hit from a very large object. Maybe a passing aileron might have made a dent, but that's as far as I would speculate. SPECULATE, please, I am in no position to make definitive statements here...
A picture of the airplane in question, to put things in perspective. Sorry, this was the largest image I found that wouldn't distort the forum layout.
And yes, the registration number is PK-AXC.