I think someone bumped my car

Walking to the car this morning I noticed some impressions on my rear bumper. I have no idea what they are from nor do I see any stress marks or scratches on the paint work.

I do have a suspicion that someone bumped into me. Not sure if it is a trolley or car or what but the marks don’t seem to be those that could appear otherwise.

Note: top right corner is reflection of my arm (had me confused when I saw the pic. Marks I am referring to are the straight/rectangular lines and the area of dots clumped together.






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