I wouldn't bother honestly. You don't want them to think you're gonna be one of those that bugs them about every placement and if they know about it or not. If they are a US based publisher they probably won't have any details about it, and probably won't even know about it unless they're tracking it via their Source Audio detection software. If that's the case then the placement probably came from one of their foreign sub-publishers most likely, and they're focused on getting music licensed, not informing everyone about every single placement If it was a foreign publisher who is working within their native territory, they might have more info but even so I wouldn't bug them about it. Just keep cranking out music and placements will be a regular thing. I know the feeling - but you just gotta trust the process and the system. You won't see the royalties for awhile - foreign royalties take awhile to trickle in.