The U.S. Postal Inspection Service, alerted by New York police, found the drawing Friday at Kennedy International Airport, The New York Times reported.
"Cartel de Don Juan Tenorio," an 11-by-14-inch drawing valued at $150,000, was stolen June 19 from a newly opened gallery on the Upper East Side, Venus Over Manhattan. Security cameras showed a man with a shopping bag who apparently just took the drawing off the wall and walked out.
"There was a security guard standing right there, so how you don't see a young, sweaty guy with a shopping bag I don't understand," Adam Lindemann, the writer and collector who owns the gallery, told reporters at the time.
Donna Harris, a spokeswoman for the postal inspectors, said stolen art tends to be impossible to sell "because they're hot." She said the gallery got an e-mail with the Express Mail tracking number.
The drawing was mailed from Europe.