Brake fluid is really corrosive to paint, could be a leak or some carelessness of the mechanic.
Kevins a great guy, and Bayside is a great place for parts... but that mechanic doe.
Good luck on the claims though, think about it like a car going into a body shop. Most are too lazy, or just careless to not take pictures of all damage prior to taking a car in. You probably wont get anything TBH or any sort of reconciliation, just take it as a lesson, whenever you leave a vehicle with a shop, do a walk around and ask them to take pictures of all existing damage.
Edit: For the brake reservoir, the side face you, it could be corrosion damage which caused it to chip. On the side not facing you, it looks like someone was trying to pry it or something...
And does the rear wheel really need replacing? I mean if you got money out yo ass by all means, but it doesnt look that bad, especially if you cant get someone to be accountable for it.