Eugen,
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Documents were lost and it is not possible to verify the data.
This is not true. Some documents are lost, other documents are safe. According to survived documents the collision on the 5th mentioned by Franek could have happened, but only during the aerial fighting of 112 eskadra with another German formation. It was reported by a Polish pilot long after the campaign`s end and has no confirmation in any other document. However this "maybe collision" has nothing to do with the mission flown by I./ZG 1.
And I don`t know anything about further Polish losses you could attribute to I./ZG 1 on the 4th September (up to the mentioned P.23 in Naklo area).
Regards,
Marius