Aubrey Reid Letter a will hidden quest (spoiler) (Vampyr)

Hi all.
Has anyone found all the letters from the father GG - Aubrey reed?

I found the first two.
1 - in my father's office GG.
2 - in the garden East of mansion. Hidden in a box near the house. Just do not say where...
3 - should be in Ambroksol the hospital. But where, exactly?