Most certainly a scam, or at the very least It's opportunist deception..
They are intentionally selling these boxes of 10 at 100 box prices in the hope someone will buy one by accident.
They aren't legitimately valuing these boxes at 90k because that's how much they want to sell them for.
Unfortunately they aren't breaking any rules.
I've seen it happening with 0 slot Chain Mails as well.