[KraMax]

There are no certificates that RPG-1 existed. RPG-1 was the experimental sample - works on its creation have ended in 1947-48 when was already ready RPG-2 which had more the best characteristics.
Also you will not find that any documentary proof that the Red Army used AFTER war - German panzerfaust or panzersrek.
Trophy panzerfaust and panzersrek - were transferred - to assault-engineering-sapernym parts of Red Army - during war 1944-45 and were used by them for carrying out of assault operations - for example, for destruction of well strengthened fire points of the opponent, storm of Berlin, etc.
AFTER war all trophy weapon was - is handed over on warehouses, the further destiny of this weapon to trace difficult.
I searched in Google - "RPG-1 grenade", "RPG-1", "Panzerfaust" - I have not found any information on that that RPG-1 there was on arms of Red Army, besides that this experimental weapon which was never produced in lots. Also I have not found the information on that that panzerfaust - were used by Red Army AFTER war.

p.s. I have resulted RPG-1 for an example, I can result for an example still the weapon from present OOB of which was not and was not present in USSR/Russia.

p.s.2. sorry for my bad English