Police Officer went to a former place of residence saying my lost phone was found at a store. I never lost my phone.

So weird. A legit police officer (in a marked car) went to my childhood home and asked if I was there, I don’t live there anymore so they of course said no but I was their brother. He then asked if I had lost my phone, because it was evidently found at this local store. They said they didn’t know but they’d ask. Police officer says “well if he has lost it tell him to call the sheriff and ask for this unit # to get it back”. I call my BIL after he texts me and the cop was still there, he goes and tells him I have my phone and the cop is just like “oh okay weird”

What is going on here? Seems so scammy. But BIL says it was for sure a real cop. Anyone ever heard of a scam like this?