I got mine as well yesterday. The white white adhesive holding in the DOM (no latch) doesn't go that deep. You can pry it back along the edge with a sharp blade and then start wiggling it out while looking for parts still sticking to poke at. It came out pretty easily.
Edit: Just had some issues loading pfsense after installing. It would not boot off the DOM until I used the workaround detailed by
@BLinux where installing using the ZFS option allows you to boot via UEFI. I'm very thankful he posted that this weekend as it was still in my memory when I ran into this and didn't need to spend much time troubleshooting.