At intervals of two or three weeks, beginning in the summer of 1871, registered packages passing to and fro from Chicago to a town in the interior of Dakota Territory, which for convenience will be called Wellington,—­though that was not its name,—­were reported to the department as rifled.  As the season wore on, the complaints increased in frequency.  Under the old method of doing business at headquarters, which often amounted practically to a distribution of the cases about equally “among the boys,” the agent stationed at Chicago received most of them at first; then a part were sent to an agent in Iowa; and as the number multiplied, Furay, at Omaha, was favored with an occasional sprinkling.  Under the present more perfect system, great care is taken to group together all the complaints growing out of each series of depredations, to locate the seat of trouble by comparisons carefully made in the department itself, and to give everything bearing on the subject to the officer specifically charged with the investigation.

March came around before Mr. Furay found time to give personal attention to this particular thief.  He then passed over the route to Wellington, eighty miles by stagecoach from the nearest railroad station, with ten intermediate offices.  All the packages remained over night at Sioux City, Iowa, a fact sufficiently important to invite close scrutiny; but the detective soon became satisfied that he must look elsewhere for the robber.  His suspicions were next directed to another office, where also the mails lay over night; but the postmaster bore a countenance so open and honest that he too was eliminated from the problem.

He continued on to Wellington, skirmishing along the line, and observing the faces of the postmasters; but these studies in physiognomy threw no light on the mystery, as the officials of the department on the route, though far removed from central supervision, seemed to be all that their affectionate uncle at Washington could wish.  On the return trip the detective was equally observant and equally perplexed.  At that season the stage stopped for the night at Hannibal; but there, likewise, the postmaster shared the honest looks that seemed to prevail through eastern Dakota.

Proceeding on, the passengers dined at Raven’s Nest, where one Michael Mahoney, Sr., kept a small store and the post-office, running also—­with the aid of a young son and a son-in-law—­a farm.  The store was managed by Michael Mahoney, Jr., a married son, who happened to be absent both when the special agent went up and when he returned.  The face of the old man indicated that he was vicious, ignorant, and unscrupulous; but clearly he was not sharp enough to execute nice work like that under investigation.

With the exception of a general knowledge of the offices, the special agent returned but little wiser for the trip, and concluded, as the best that could be done under the circumstances, to allow the bird to flutter a little longer before renewing the hunt.  Meanwhile the thief grew more reckless, and the papers that came to Mr. Furay, though covering a fraction only of the depredations, located the thief on the lower end of the route, within fifty miles of the terminus.