Checking for 'mass_storage_dummy' leaves potentially confusing message in logs

I just noticed the following message while upgrading my evergreen: md5sum: /var/lib/mass_storage_dummy: No such file or directory

This comes from https://source.puri.sm/Librem5/librem5-devkit-tools/-/blob/pureos/byzantium/debian/librem5-devkit-base.postinst#L26

We should probably check for the existence of that file first before running md5sum against it?

Also I was wondering why librem5-devkit-base was installed in the first place (the word devkit had me wondering). aptitude tells me it was installed manually but I can't remember doing that (an in fact my bash history doesn't show anything either). So after looking at the package contents a bit closer I guess the ship-me script would be one of the reasons why it's (presumably) installed into the image that is build by jenkins?