Hi Boris,
I also bought two sets painted on EBay, mixture of two editors to complete those I had earlier... And I started to unpainted them too. I noticed that their preparation (removal of defects, holes, ...) was quiet poor if not absent, so they have all to be repaired.
I will prepare the documentation to send it later in the day to you. I might have too many flats, as my objective is to paint only one side for framing, and therefore to keep only two flats of the same shape, to paint each side, and gt rid of the others.
I can make a list and pictures.
I will also scan a booklet related to the Strelets flats and edited in Germany, and send you the PDF file.
Michel