So since my other dongles are on backorder and the Fanstels need secure firmware which I haven’t found out how to do, I thought I would open one.
Couple of things to note: These are labelled BT840F not USB840F like I have been searching for and finding almost nothing about. Also the serial numbers do not look long enough to be individual. Kind of want to open another Dongle to see if the numbers are different.
On the other side is the 2 buttons I might need, if this thing does not go into DFU mode. So that issue is solved, thanks for the suggestions to open it up @Zonker
I think nrf-Connect for Desktop can automatically put the device into DFU mode so that is probably why these Dongles are sealed up.
My seeedstudio dongles are supposed to ship late January. Hopefully as @peekay123 thinks, they are pre-installed with the OpenThread Border Router connection firmware.