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I found the key and used it to open the cabinet, and then used the thing in the cabinet, and still can't figure out the door code...


Edit: never mind; found a walkthrough on YouTube and saw the answer below. Ah, it's like the old school days of puzzle adventures...

Thanks so much! Between both sessions we're at a couple of hundred views on YouTube, plus additional views on Twitch, so more than one person is watching! 🙂