The anonymous person was Gery-Pieret. A former employee of the Louvre, he'd had little difficulty smuggling the obscure works out of the facility. Shortly thereafter, he'd managed to sell them. The buyers? One was sold to the art collector and dealer Apollinare, while the other one was purchased by his friend, Pablo Picasso. Picasso, a Spanish citizen living in Paris, was frightened that he might be deported if his involvement in the "affair of the statues" was revealed so he nervously arranged through Apollinare to get rid of his "hot" art relic. The two carved heads were quickly returned via the Paris-Journal.
Police apparently WERE informed of Apollinare's identity. They arrested him and charged him with harboring a criminal thought to be connected with the Mona Lisa theft. But after four days of interrogation, they released the reputable gallery owner. Picasso's name was never mentioned. He continued to live in France for the rest of his life, his involvement in the nasty little affair not revealed until some thirty years later. Likewise, it turned out that Gery-Pieret had nothing whatsoever to do with the theft of the Mona Lisa either. The immortal queen of the Louvre was successfully ransomed sometime later.