Officers who checked the coffins contain bodies were reassured to find they were intact, Polish police spokeswoman Hanna Wachowiak said on Tuesday.
“It was not like it was a mushroom-hunter who found them. This is the result of an intensive police operation since the theft,” she added.
The van was found near Krolikow, central Poland, a week after it was stolen from a car park in the Hoppegarten area of Berlin.
Police arrested two men aged 25 and 27 in Poznan over the weekend, and are hunting for two others thought to have been involved in the theft of the van and two other vehicles.
Wachowiak said it did not seem as if the thieves had any idea what was in the van when they took it. The bodies had been set for cremation in Meißen.