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I'd never had a meta account and it still came up with the same stuff, but I got the email to reset it.Nope, nothing in the spam folder. However, when I try a random PIN number it says "Incorrect PIN. The PIN that you've entered doesn't match the PIN you created for your Oculus account. Please try again."
So yes, I must have set up a PIN a few years ago when I first made an Oculus account after I bought a Samsung Gear VR headset. And when I installed the Meta Quest app a couple of weeks ago, it found my old Oculus account and transferred it. Looking through my phone's saved memos, I found I saved a note of my Oculus password and email address but no PIN number.