This document would be useless for purposes of fraud, inasmuch as it provided that the valuable should only be given up on the personal application of the owner.

As soon as he recovered himself, Mr.Luker hurried to the bank, on the chance that the thieves who had robbed him might ignorantly present themselves with the receipt.

Nothing had been seen of them when he arrived at the establishment, and nothing was seen of them afterwards.

Their respectable English friend had (in the opinion of the bankers) looked the receipt over before they attempted to make use of it, and had given them the necessary warning in good time.
Information of both outrages was communicated to the police, and the needful investigations were pursued, I believe, with great energy.
The authorities held that a robbery had been planned, on insufficient information received by the thieves.

They had been plainly not sure whether Mr.Luker had, or had not, trusted the transmission of his precious gem to another person; and poor polite Mr.Godfrey had paid the penalty of having been seen accidentally speaking to him.