The Administration were quite ignorant.
A nurse had left the child there, "Angelique Marie," without naming the mother.

In despair he was about to return to Beaumont, when a new idea impelled him to return for the fourth time to the office, to see the book in which the arrival of the infant had been noted down, and in that way to have the address of the nurse.

That proved quite an undertaking.
But at last he succeeded, and found it was a Madame Foucart, and that in 1850 she lived on the Rue des Deux-Ecus.
Then he recommenced his hunting up and down.

The end of the Rue des Deux-Ecus had been demolished, and no shopkeeper in the neighbourhood recollected ever having heard of Madame Foucart.

He consulted the directory, but there was no such name.