I added a better pic of the first one

First board. Low Peripheral.
Second board. No comment. Remove the piece of metal. What's under it?
Third and fourth board. High Peripheral.
As always. One can email Boardsort for evaluation.

The display board I concur is likely low peripheral. Depending on the board they're usually low or high peripheral.

I believe the "piece of metal" is a circuit board with gold on the side facing us. Depending on what's between the two boards I'd guess you're somewhere from low peripheral to low Telco on it. If you can't get it apart easily but can tell there's high value components (ICs, tantalum, etc) I'd just go high peripheral with it.

The board with multiple Sim slots, Boardsort doesn't want the sim card, but I agree high peripheral. Side note, it's definitely on the higher end of high peripheral, I don't think it's enough to push into low Telco though.

Last board I also agree

_________________
Here to learn more so I can recycle more
My grades are my own opinion and not an official grade from Boardsort

Yep. I believe you are 100% correct. That thing I called a piece of metal. Is a circuit board. Most likely a custom made substrate board. I looked up AT&S. They manufacture that type of board. Also. Protel Inc. Who assembled the PCB. Probably bought that AT&S board to install on thier own board.
Both Protel and AT&S service communications.
I should have figured as much.
The ESD warning symbol. Also the part numbers on said "piece of metal". Should have paid attention to that.
Yeah. Still developing skills to evaluate the value/category of the boards. I got to start paying more attention tant caps etc.
But. That's what this forum is here for.
I still would like to see under that AT&S board.