The content of my /boot partition looks like this:
purism@pureos:~$ ls -l /boot
total 93624
-rw-r--r-- 1 root root 2328 Apr 23 01:35 boot.scr
-rw-r--r-- 1 root root 2328 Apr 18 11:30 boot.scr.bak
-rw-r--r-- 1 root root 189373 Apr 13 12:53 config-5.16.0-1-librem5
lrwxrwxrwx 1 root root 53 Apr 23 01:35 dtb -> dtbs/5.16.0-1-librem5/freescale/imx8mq-librem5-r4.dtb
lrwxrwxrwx 1 root root 53 Apr 23 01:35 dtb-5.16.0-1-librem5 -> dtbs/5.16.0-1-librem5/freescale/imx8mq-librem5-r4.dtb
drwxr-xr-x 5 root root 1024 Jan 23 02:17 dtbs
drwxr-xr-x 2 root root 1024 Jul 13 2021 grub
-rw-r--r-- 1 root root 65444751 Apr 23 01:35 initrd.img-5.16.0-1-librem5
drwx------ 2 root root 12288 Sep 11 2021 lost+found
-rw-r--r-- 1 root root 4962659 Apr 13 12:53 System.map-5.16.0-1-librem5
-rw-r--r-- 1 root root 24875016 Apr 13 12:53 vmlinuz-5.16.0-1-librem5
i.e. there are no non-serialized versions.