What should I do? (accident?)

Hey, it’s the following. I’ve seen that I have yellow color at the back of the car. Which is not normal, because the car is actually completely black. Besides this color there were minimal scratches, which is hardly noticeable. Well, of course I ask myself the question, where this can come from. After a long thought I realized that I was standing in a house entrance this morning, which is right next to a bus stop (the buses are here yellow). And since there are not so many yellow cars, there is probably only one bus in question. But it must have happened at this driveway, because neither my school nor my house buses drive past. Now the question arises. 1. The scars are minimal with me. But if a bus is scratching me with its side at the rear, I would have to notice it in the car or not? Such a thing weighs a hell of a lot, because I would still have an ordentlic The only thing I noticed was a long beeping from the parking aid. But it starts already at about 1 m distance. 2. What should I do? I’m not even sure that it happened at this point, but what else is unlikely. I’m not even sure if I caused the damage by possible reverse driving by letting go of the brake and driving against the bus? 3. The damage is minimal, but if it is my As I said, I didn’t notice anything, but I think that I should have to prove it first in this case. If it was the fault of the bus, did I also commit a driver’s flight? As I said, I didn’t notice anything! I really care about my driver’s license, maybe it happened at the parking and it was actually just a yellow car that rammed me? I’m still in the probation period, what should I do? I was thinking about the police. “Maybe a bus or a yellow car rammed me, but I don’t know. But I may also have rammed the bus by inadvertent driving backwards, but I didn’t notice anything. Or it was a yellow car that rammed me when I parked.”