How would anyone go about proving that scenario?
It might not be easily proven, but the converse of it should be. If Hawaii had just released the original document, and attested that it was in fact an original document created in the normal and usual process, that would pretty much preclude other possibilities from being correct.
Since they have made such an effort to distance themselves from any certainty as to whether or not the record we see is the original, it merely reinforces our suspicions that they are intentionally hiding the original.
There is no need for conditional statements. That they keep putting them into their letters makes me think that they see a need for them.