It was nice of a fellow inhabitant of my apartment building to give me a package he had found that had my address on it. It was apparently put in the elevator by 'non-delivery service' DPD. I never take the elevator, how should I have known?

It had already been opened by other people and is likely no longer complete. Since it was not a package I was expecting or ordered (a surprise), I don't know whether any contents are missing.

So in addition to not using DHL as I mentioned earlier, we shouldn't be using DPD either.