Are there any sources of identification? A collar or something of the sort?

[Obviously Harald can see the Eevee through the video screen, but it feels worth asking just in case there's something he missed.]

Does it respond as easily to 'Eevee' as most other Pokémon do to their own names? If not, then it may already have a nickname; and while not having one isn't a sure sign that it's wild, it likely belongs to someone if it does. Or maybe it'll just be a fickle thing. It's hard to tell.