Are you sure it said "And Harry was happened to be..." I think that may be an error.
In any case, we say "He happened to be" to show what a happy coincidence it is that something that is needed is already there.
A: I need a pen.
B: I happen to have a pen right here. You are more than welcome to use it.
A: Oh no! I need to get to the airport and my car has a flat tire.
B: Oh, I happen to have a friend with a flight this afternoon. Let me call him and see if he can give you a ride.