Painting that reportedly has its own Louvre mailbox (4,4)

I believe the answer is:

mona lisa

(Other definitions for mona lisa that I've seen before include "Leonardo da Vinci's painting of enigmatic woman" , "Da Vinci's famous painting of an enigmatic woman" , "Mysterious-smile Louvre portrait" , "Picture" , "Leonardo da Vinci's enigmatic portrait" .)

I've seen this clue in the LA Times.

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