Sergey Romanov wrote: In order to sort out the post-May 1940 documents and to put some incriminating newspapers, letters etc. in the envelopes the German on the motorcycle should have travelled to some other place than the secret police office, there he should've opened all the envelopes, sorted out all the papers, planted the new ones, closed all the envelopes and travelled to the office. It would take considerable time to do all this and the Poles waiting in the office would notice it.
No problems - they could change those envelopes with previously prepared envelopes contained yesterday's already sorted documents or something like that. Besides Germans had enough time to prepare things before the Red Cross had arrived there.