The cost of the manuscripts on the "black market" can reach tens of millions of dollars.

According to Vozniak, only Cyrillic old-printed books have been inspected. "Obviously, all these books were plundered for decades. We have not yet checked the black letter books in German, Polish and other languages. They are even more import-attractive," he said.

Read alsoPolice uncover flat allegedly with Azarov's things: "Icons, award guns, paintings" (Photos, video)The management of the gallery has already filed an application to the Security Service of Ukraine (SBU) and the police. "We want to make this public in order the fact not to be hushed up," Vozniak said.

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However, according to news agency, there have been no reports of the disappearance of rare books submitted to the Lviv National Police Headquarters by the art gallery, but they also noted that this could be a decade old case.