Where do the Let’s Encrypt and SSL It! extensions keep .pem files for private and public keys on a file system?

On Linux systems, the .pem files are located in these directories:

For the Let's Encrypt extension -  /usr/local/psa/var/modules/letsencrypt/etc/archive/example.com/

For the SSL It! extension - /usr/local/psa/var/modules/sslit/etc/archive/example.com/

The contents of this directory would be similar to the following:

# root@server:/usr/local/psa/var/modules/sslit/etc/archive/example.com# ls -alh
total 92K
drwx------ 2 psaadm psaadm 4.0K Sep 9 17:56 .
drwx------ 22 psaadm psaadm 4.0K Mar 7 2024 ..
-rw-r--r-- 1 psaadm psaadm 1.8K Jan 13 2024 cert1.pem
-rw-r--r-- 1 psaadm psaadm 1.8K Mar 13 2024 cert2.pem
-rw-r--r-- 1 psaadm psaadm 1.8K May 12 17:56 cert3.pem
-rw-r--r-- 1 psaadm psaadm 1.8K Jul 11 17:56 cert4.pem
-rw-r--r-- 1 psaadm psaadm 1.8K Sep 9 17:56 cert5.pem
-rw-r--r-- 1 psaadm psaadm 3.7K Jan 13 2024 chain1.pem
-rw-r--r-- 1 psaadm psaadm 1.8K Mar 13 2024 chain2.pem
-rw-r--r-- 1 psaadm psaadm 1.8K May 12 17:56 chain3.pem
-rw-r--r-- 1 psaadm psaadm 1.8K Jul 11 17:56 chain4.pem
-rw-r--r-- 1 psaadm psaadm 1.8K Sep 9 17:56 chain5.pem
-rw-r--r-- 1 psaadm psaadm 5.5K Jan 13 2024 fullchain1.pem
-rw-r--r-- 1 psaadm psaadm 3.6K Mar 13 2024 fullchain2.pem
-rw-r--r-- 1 psaadm psaadm 3.6K May 12 17:56 fullchain3.pem
-rw-r--r-- 1 psaadm psaadm 3.6K Jul 11 17:56 fullchain4.pem
-rw-r--r-- 1 psaadm psaadm 3.6K Sep 9 17:56 fullchain5.pem
-rw-r--r-- 1 psaadm psaadm 1.7K Jan 13 2024 privkey1.pem
-rw-r--r-- 1 psaadm psaadm 1.7K Mar 13 2024 privkey2.pem
-rw-r--r-- 1 psaadm psaadm 1.7K May 12 17:56 privkey3.pem
-rw-r--r-- 1 psaadm psaadm 1.7K Jul 11 17:56 privkey4.pem
-rw-r--r-- 1 psaadm psaadm 1.7K Sep 9 17:56 privkey5.pem

Note: The files with the most recent dates are the ones that are in use currently