Missing library board files

I'm using an Itsy Bitsy nRF52840 and I have installed the board files required but I seem to be missing some files in one of the libraries that are in the GitHub repo.

These are the files on my computer:

and these are the files located in the GitHub repo. I highlighted the missing ones:

The Arduino IDE indicates that I am on the latest version of the board files (0.21.0) But I seem to be missing those security files. Ive tried to add them but the IDE seems to have a fit when I try to do that. Im using the Arduino Pro IDE version 2.0.0-beta.5

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It's because they were added after the time of the 0.21.0 release. If you check the repository at the time of the 0.21.0 tag, you'll see it's just the same as on your computer:
https://github.com/adafruit/Adafruit_nRF52_Arduino/tree/0.21.0/libraries/Bluefruit52Lib/src

The pull request that added those files to the library:

was merged 2020-09-11, but the 0.21.0 release date was 2020-08-31

Is there any way i can work with those files?

You can install the development version of the Adafruit nRF52 Boards platform by following these instructions:
https://github.com/adafruit/Adafruit_nRF52_Arduino#optional-core-development-adafruit-nrf52-bsp-via-git

Unfortunately, Arduino Pro IDE does not currently support boards platforms installed in the sketchbook, so you'll need to use Arduino IDE 1.8.14 instead.

Thank you I appreciate the help

You're welcome. I'm glad if I was able to be of assistance. Enjoy!
Per