7,800 chips per large box.
Which would mean you'd need
270 boxes of chips to equal 2.1 million. I've never seen a photograph of 270 boxes.
There may be other evidence that that many have been made, but there's never been a photograph of all of them in one place, as far as I know.
Someone posted a link showing tracking data on 135 boxes somewhere - that totals 1.05 million chips, about the same number that Yifu claims to have produced.
The above post with the tracking shows 135 boxes. Even 1mm chips would be hard for one group to roll out. power (heat) density problems would be very hard to get solved. but they have had 7 weeks to work on it, so just wait. it will come