Bertini's duty was to examine passengers' baggage registered beyond Paris, and when it was placed upon the counter in the Customs House, he kept an open eye for any jewel-cases. Exercising his power, he would have them opened and inspect their contents, and then, being replaced, the box would be locked by the unsuspecting passenger. The Customs Officer would, however, chalk a peculiar mark upon the trunk containing the valuables, and during its transit between Calais and Paris Jeanjean would go to the baggage-wagon, and, with a big bunch of duplicate keys, unlock the marked trunks, abstract the jewellery, and relock it again. By the time the unfortunate passenger discovered the loss, the stolen property would probably be on its way into old Vernon's hands for disposal in Antwerp or Amsterdam.
Thus the two made some huge _coups_. In one instance, the pearls of the Duchess of Carcassonne, valued at forty-five thousand pounds, were secured, and never traced, for they were sold east of Suez. In another instance the celebrated diamond necklace belonging to Mademoiselle Montbard, the famous actress at the Ambigu in Paris, worth thirty thousand pounds, was abstracted from her baggage. Emeralds to the value of over twenty thousand pounds, the property of the wife of an American millionaire, and the whole of the famous jewels of the Princess Tchernowski were also among the articles stolen.
So constant, however, were these mysterious thefts, that at last the police established a strict surveillance upon all baggage, and hence the interesting little game was at an end.
Matters grew a trifle too warm, and though neither Jeanjean nor Bertini changed their mode of life with their rapidly-gained wealth, yet it was felt that to retire was best. So, within a month of each other, they left. Jeanjean crossed over to England, and Bertini accepted promotion to Boulogne, where he remained several months, fearing that if he resigned too quickly suspicions might be aroused.
Of course, after this, the organized thefts between Calais and Paris ceased suddenly, though the Company never entertained the slightest suspicion of the guilty persons, or of the mode in which each trunk containing jewellery was made known to the thief.