Interrogated by the Swiss police in May 1943, Eiss admitted to having worked together with Polish diplomats to illegally obtain a fake passport from a corrupted honorary consul of Paraguay Rudolf Hugli. ‘"I always contact the Polish Consul, Rokicki, who then, in turn, contacts the Paraguayan Consul, Hügli in Bern, who issues the documents. Then, presumably, Rokicki must pay some amount to Mr Hügli. The certificates are then be sent to Poland in the original, whereas the passports are to be photocopied and the copies notarised"’, . Eiss would then obtain the copies of the passports, presumably through the Polish-Jewish diplomat Juliusz Kühl, right-hand of the envoy of Poland Aleksander Ładoś and have them smuggled into the German occupation zone. The letters contained certificates showing that the person concerned had been granted Paraguayan citizenship. In many cases, Eiss provided the names of his acquaintances as the senders so as to make sure that his own name was not revealed to the censorship authorities. ‘All the addressees were religious Jewish persons living in Warsaw and Będzin’, he declared.