In Denmark, the police stole a motorbike from me once!
I moved into an condo complex close to the army base I was stationed at, and apparently my new neighbors didn't realize the motorcycle (an offroad/cross bike) belonged to me, and complained to the local police who impounded it. (Because it was an offroader, it didn't need or have registration, so they couldn't "trace" it to me.
When Itthought my bike had been stolen, I obviously called the police - who told me it had been impounded, but I could go and pick it up at their warehouse.
Funny thing is, when I went, the guys who managed the warehouse (civilian employees) "couldn't find" it.
Bastards. Because it wasn't registered, I have no doubt that one of those bastards stole it, and either sold it, or enjoyed riding around on my bike.
That was over 20 years ago, and I'm still pissed!