Smart dealers react like yours did. Whether or not they think it happened before or after you picked up the vehicle, they figure the small cost to them is worth it as a sales development action, making it more likely they'll sell you another BMW down the road. They probably take care of quite a few door dings and bird droppings on their inventory vehicles, and the sales department picks up the cost in their budget as a sales development cost.

But then not all dealers are smart!

Glad to see yours is.