Thus three months went by with no result; then four, five, six months; and, finally, all but a year. Then, suddenly, in April, 1889, Crawford took his departure for Central America, giving out to his friends that he was going there to assume the management of a banana plantation of sixty thousand acres, owned by his wealthy friend and benefactor.
Before Crawford sailed, however, the "shadows" had informed Mr. Pinkerton of Crawford's intention, and asked instructions. Should they arrest the man before he took flight, or should they let him go? Mr. Pinkerton realized that he was dealing with a man who, if guilty, was a criminal of unusual cleverness and cunning. His arrest would probably accomplish nothing, and might spoil everything. There was little likelihood that the stolen money would be found on Crawford's person; he would probably arrange some safer way for its transmission. Perhaps it had gone ahead of him to Central America weeks before.
"We'll let him go," said Mr. Pinkerton, with a grim smile; "only we'll have some one go with him."
The Pinkerton representative employed to shadow Crawford on the voyage sent word, by the first mail after their arrival in Central America, that the young man had rarely left his state-room, and that whenever forced to do so had employed a colored servant to stand on guard so that no one could go inside.
Nothing more occurred, however, to justify the suspicion against Crawford until the early part of 1890, when the persistent efforts of the detectives were rewarded by an important discovery. It was then that Robert Pinkerton learned that Crawford had told a deliberate lie when examined before the bank officials in regard to his family relations in New York. He had stated that his only relative in New York was a brother, Marvin Crawford, who was then driving a streetcar on the Bleecker Street line. Now it came to the knowledge of Mr. Pinkerton that Crawford had in the city three married aunts and several cousins. The reason for Crawford's having concealed this fact was presently brought to light through the testimony of one of the aunts, who, having been induced to speak, not without difficulty, stated that on Sunday, May 6, 1888, two days after the robbery, her nephew had called at her house, and given her a package which he said contained gloves, and which he wished her to keep for him. It was about this time that the papers contained the first news of the robbery, and, her suspicions having been aroused, she picked a hole in the paper covering of the package large enough to let her see that there was money inside. Somewhat disturbed, she took the package to her husband, who opened it and found that it contained two thousand dollars in bank-notes. Realizing the importance of this discovery, the husband told his wife that when Crawford came back to claim the package she should refer him to him, which she did.