Tricky one......I'm not sure. Me personally I would query the lap top in an innocent tone cos you think he isn't allowed it at work.... but that's just me and I'm not sure where your H is at with regards to if he still feels like you are checking up on him. (I know my H thought this for ages after he came back but doesn't now so I would feel totally OK about asking him such a question). That said my H still keeps his mobile with him at all times and he didn't before but I seem to have just let it go.
If I were asking my H I'd just say "how come you're taking the laptop to work? Are you allowed them now??" in a really light manner. Good luck with however you decide to handle it - good luck, IP.