That means that they were very quick loading whatever vehicle they used with their plunder.

I should think, myself, that they first carried everything from this house down into the hall of the house next door; and then, of course, they could be very quick getting them from hall to their van, or whatever it was.

But still, some one saw that van--saw it drive up to the house, or waiting at the house, or driving away from it." "Is M.Formery coming back ?" said the Duke.
"Not to-night," said Guerchard.

"The affair is in my hands now; and I have my own men on it--men of some intelligence, or, at any rate, men who know my ways, and how I want things done." "It must be a relief," said the Duke.
"Oh, no, I'm used to M.Formery--to all the examining magistrates in Paris, and in most of the big provincial towns.

They do not really hamper me; and often I get an idea from them; for some of them are men of real intelligence." "And others are not: I understand," said the Duke.
The door opened and Bonavent, the detective, came in.
"The housekeeper's awake, M.Guerchard," he said.
"Good, bring her down here," said Guerchard.
"Perhaps you'd like me to go," said the Duke.
"Oh, no," said Guerchard.