Alexander Nizyuk said police had freed the two men Tuesday without bringing charges.
"Yakubovsky, in his turn, was transported last Friday to another prison, Kresty," Nizyuk said, referring to a high-security jail in St. Petersburg.
Commersant Daily reported that the guard and driver had been detained in mid-December at an apartment in St. Petersburg where a stolen hoard of books and manuscripts was also found.
Yakubovsky was detained Dec. 20 and accused of involvement in the theft of a collection of ancient books.
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