How to check Qubes authenticity without the iso?

sm95’s clued me in on the KeySlots NOT being the same as FDE — prior I was clueless

1st Star Labs NEVER sent instructions until I asked and those instructions were only about user password changing and Key Slot password changing and deleting

NEVER did Star Labs mention the FDE so I assumed the FDE had to be the Key Slots but @sm95 informed me these are two different things

Star Lab email is as follows: