While the card doesn’t say how and where Arnold entered Brazil, its storage in Sao Paulo suggests he likely arrived in that city. Sao Paulo is the largest city in South America — even bigger than New York City — and is a major landing spot for travelers coming by both air and sea.

Providing further intrigue are the two typed messages on the back of the card.

The first, which appears to be dated 1968, suggests Arnold’s entry was immediately flagged by Interpol, which asked for more information on him. It said the FBI was looking for the man who, it noted, may also go by the name “Les Arnold.”

The second entry, which appears to be dated 1971, is more difficult to decipher, featuring bureaucratic language and several abbreviations. But it ends with the phrase “without capture.” That reference could be interpreted several ways: that Brazilian authorities tried to capture him and failed, that they wanted him located but not immediately captured, or that they didn’t want him captured at all.

There’s no question that Brazil has a historical reputation for being reluctant to extradite its citizens.