I found some bobby pins in my boyfriend's car that are not mine?

Hello guys! Todat I went with my boyfriend to a friend of ours. While he was driving, I found two white bobby pins with glitter on them. I asked him about them, but he said he doesn't know. Then, I asked him if any girl was in the car and he said that last year a coworker that I know and he added that she doen't wear bobby pins, especially with glitter. His mom has a very short hair and there are no relatives. What should I think or do?
I found some bobby pins in my boyfriend's car that are not mine?
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