My guess is that kleinbl00 and ghostoffuffle could help contribute to this tag. I don't have any vintage gear, myself. Though, my acoustic guitar would likely be considered vintage at this point. It's a 1978 Gibson J50. I love it. But no audio/recording gear to speak of. Kleinbl00 would call my MBOX vintage, I'm sure.
I would call your mBox old. There's an implication in "vintage" that it has merit. I don't think I have anything that would qualify as "vintage" as I pretty mercilessly update. I finally let go of my H3000D/SE, which people on eBay describe as "vintage", once Eventide's H3000 Factory had enough of the algorithms to make it too much of a hassle to go through the hardware. I still miss some of the algorithms, which they keep telling me we'll be beta-testing soon. The oldest pieces of gear I have don't make sound, and are owned because they dust the shit out of anything modern for anywhere near the price. I have a Roland A-80, the biggest, scariest, nastiest, heaviest weighted 88-key controller ever made, which has polyphonic aftertouch (and which I've modded so that you don't have to break a finger to make it work). That, combined with the Arturia CS-80V, is a treat and a half. And I have a DK MSD600M, but that's only because a 600Mplusplus (one of these days we must fix the markup) is about a $6k meter while my MSD600M was $350 on eBay. Yes, I'm still proud of that score.