Did you collide with another car while shopping with your shopping cart?

I was just shopping and because the wind was a bit strong, my empty shopping cart collided with another car at an angle, but extremely slowly and not quickly. The corners that hit the car are rounded off with plastic (probably for exactly this kind of incident?). The car was an old family car and already had enormous scratches on the side. Then I looked at the side more closely and found a tiny scratch about 3 cm long that could possibly have been mine. But I'm not sure. There were already 10,000 scratches on it and two huge ones. I vaguely remembered a mother and her child who owned the car. So I went back into the store, looked for them, spoke to someone who wasn't it, but I couldn't find them anywhere. I went back to the car and waited in my car. Then I realized that because the car already had so many scratches, what if the tiny scratch honestly wasn't mine and I tell them it is, even though it probably wasn't mine at all? Of course, I didn't want to pay for something I didn't do. I can't imagine that at the low speed the shopping cart hit it, it could have actually left a scratch. Especially since it wasn't even the metal of the shopping cart that touched the car, but rather those rounded plastic corners. Def was really very slow in hitting it. He actually only touched the car minimally. I drove away after 15 minutes. I took a photo of the car's license plate, but now I don't know if anything else came after it. If the scratch really was mine, I know it was a hit-and-run. But if it wasn't mine, which I can imagine, and someone else saw it and later went up to the woman and told her, and then she might think the scratch was mine even though it wasn't… I have no idea. The car was already very scratched beforehand. Would such a tiny scratch make a difference? What do you think? Should I report it to the police? I have the license plate, but what if the scratch isn't mine?