Larry struck several snags when he attempted to get information at the sub-station. In the first place none of the officials in charge would give him any news about the envelope unless he got an order from the New York postmaster himself. The government has very strict regulations in regard to giving out information about mail matter. But Larry was not daunted. He telephoned to Mr. Emberg, and the forces of the newspaper were set to work. Certain political wires were "pulled," and, as there were on the _Leader_ men to whom the postmaster was under obligations, that official gave the clerks at the sub-station permission to tell Larry whatever he wanted to know. "Sorry we had to have so much red tape about it," the sub-station agent said, when Larry came back with the magical paper that opened the mouths of the subordinates. "Oh, that's all right," the reporter said. "I know how it is. Now, what I want to know is, in what box was that letter posted?" and he held out the envelope Grace had given him. "Rather hard to say," spoke the head clerk. "I'll show it to all the carriers who are in now, and later to those who come in during the afternoon. They may recognize it. It's a little out of the run of ordinary envelopes we get in this section of the city." One after another several carriers scanned the envelope. All shook their heads, until it came to an elderly man. As soon as he saw the envelope he exclaimed: "I brought that in. I remember it very well." "Where did you get it?" asked Larry, eagerly. "A man gave it to me last night, just as I was taking the mail from a box down near the river," was the unexpected reply. CHAPTER XVIII LARRY IS BAFFLED This was much better than Larry had expected. To have the envelope remembered so soon was good, but to have the carrier who brought it in say he recalled having received it from the person who mailed the letter, was better yet. "What sort of a man was he?" asked Larry, his heart beating high with hope. "Why do you ask?" inquired the carrier. "I'm a reporter from the _Leader_, and I'm trying to locate Mr. Potter, the missing millionaire," said Larry. "This letter was from him." "Then I can't be of much service to you," the postman went on. "This was given to me by a man who bore no resemblance to Mr. Potter, whose picture I have lately seen in the papers." "But what sort of a looking man gave you this envelope?" asked Larry. "He was a smooth-shaven man, rather poorly dressed. I'll tell you how it was. This box, at which I was when the man gave me the letter, is at the foot of a street leading to the river. It is the last one I collect from at night. I had taken out all the mail in the box, and was just locking it up again when some one came up the street in a hurry. I looked around, for the neighborhood is a lonely one, and, as I did so, I saw a man come to a halt, as if he was surprised to see me at the box. I could see he had a letter in his hand.