There are a few more reports about Pfeiffer's activities which appear reliable though remain unverified: in 1942, or 1943, Pfeiffer sued Gestapo members in Poland who had stolen the property of a so-called 'Non-Aryan'.
Andre troværdige tilfælde kendes fra vidnesbyrd, som endnu ikke underbygget: For eks. indgav Pfeiffer i 1942 eller 1943 en klage over Gestapo-embedsmænd i Polen, som havde tilegnet sig en såkaldt „ikke-ariers“ formue.