On 14 January 1946, in Radom, the 2nd judge in the District Court in Radom, based in Radom, Judge Kazimierz Borys, heard the person named below as a witness. After being informed about the criminal liability for giving false testimony, the witness testified as follows:
| Name and surname | Józef Muc |
| Age | 56 |
| Parents’ names | Jan and Antonina |
| Place of residence | Firlej, Wielogóra county |
| Occupation | brickyard caretaker |
| Religious affiliation | Roman Catholic |
| Criminal record | none |
| Relationship to the parties | none |
Starting from 1940, I saw trucks and taxis turning off the Warsaw highway towards Firlej, and heard the sounds of shots coming from there. However, I wasn’t a witness to the executions taking place there. More often than not, I saw the cars early in the morning, at dawn. They traveled towards the sands very often, sometimes several times a day.
In the autumn of 1943, the Germans deported the inhabitants of Firlej and Wincentow who lived near the sands, screened the sands from the side of the road with some curtains and burned something there. You could see the smoke rising over the sands and feel the smell of decomposing human corpses. Evidently, the Germans were incinerating the corpses of the victims murdered in Firlej.
During the burning of the corpses, cars continued to drive towards Firlej, whereupon some large, black trucks appeared.
I don’t know what they were transporting in them. I suppose that it must have been corpses from elsewhere. The burning of the corpses ended in the spring of 1944.
After the incineration of corpses was over, the executions continued and carried on until the Germans escaped.
The report was read out.