When the files were stolen, the Formula One champion's manager, Sabine Kehm said: "It's outrageous and disgusting."
Schumacher's former hospital in Grenoble, France, reported the possible theft of the 45-year-old's medical records, after they were informed by his manager.
Without knowing the content of the documents, the clinic filed a report for theft and violation of medical secrecy.
“We cannot say if the files were authentic. However, the fact is that the documents were stolen and the theft has been reported to the police,” Kehm said at the time.
According to the Bild, the seller asked for a minimum price of €50,000 in exchange for the documents.
Germany's most successful F1 driver suffered a serious head injury after a freak skiing accident on December 29, 2013 while on holiday in Meribel, France.
He was treated in a Grenoble hospital and spent nearly six months in a medically-induced coma.
After waking, he was moved to the university hospital in Lausanne, to be closer to his home in Gland, Switzerland.
It is widely reported that Schumacher is still paralyzed but communicates with his family through blinks.
Throughout his career, Schumacher had won seven Formula One championships and 91 Grand Prix races.