1. He'd be able to sense it pertained to a magical creature! It wouldn't have any magical properties in and of itself, but there'd be that lingering feeling of, 'a magic thing once touched/was involved with this.' If helpful: he wouldn't sense death on it.

2. Yeah, there should be — I was hesitant to mention it, so you folks don't think it's a clue. There is definitely a slew of spirits running around.

You can also feel demonic and magical energies, which — well, gate of hell.