"Whether these are the same prosecutors who are now investigating HP is not clear."
- this statement looks very nice and ironic, but is not true. since then the prosecutors office have undergone huge changes, the whole structure was reformed, in fact, only low level grunts may remain, but even they where probably moved to a different division.
- regarding illegible signatures. Russia is a hugely bureaucratic country. the official documents such as a contract to supply toilet paper will have the directors name, rank, official stamp (seal) and a signature. moreover, there will also be papers with name, rank, and official stamp of the chief accountant - so the document with "illegible signature" is most probably a spoof, something HP filled for it's records.