I'll repost a comment I made on RODOH about the Dec 1942 Declaration.
-The statement did not endorse the two million figure that was being pushed by the WJC at that time.
-The statement did not endorse any of the more fanciful killing methods such as gas chambers and electric floors, nor the human soap factories and other stories Rabbi Wise was spouting.
-In a joint statement on atrocities the next year, a reference to gas chambers was expressly removed from a draft at the request of the British who felt the claim was not well supported.
-The Dec 1942 statement refers to "Hitler's oft-repeated intention to exterminate the Jewish people in Europe" but this claim that the extermination program was public conflicts with the simultaneous claim of tremendous secrecy.
-Behind the scenes, there was considerable skepticism about about these claims and the statement was made only in response to pressure by the WJC in Britain and in the USA. There were private objections to the statement. For instance, R.B. Reams of the State Department remarked: "I have grave doubts in regard to the desirability or advisability of issuing a statement of this nature. In the first place, these reports are unconfirmed and emanate to a great extent from the Riegner letter to Rabbi Wise."
-The State Department stopped forwarding correspondence from the WJC in Switzerland to NY and the State Department's unwillingness to indulge the Zionists sufficiently is what led to the conflict between State and Morgenthau's Treasury. This would eventually lead to the creation of the War Refugee Board.
I'll add that in the Raczynski material, they claimed 1M dead (in Poland) which is a lower number than what the WJC was claiming at the time. Curiously, both figures are massively understated according to the current story which requires something like 4.5M dead by the end of the 1942.
The brochure says that at the AR camps prisoners were "killed by various means, including poison gas and electrocution."
The Polish government in-exile was well aware of the influence Jews had in Britain and America and so they had an incentive around this time to appeal to Jews.