If she really did see that, the kegs would be gone.
The proof was easy.

If the brandy and silk were gone, the door of the vault would be open.

If the things were not fetched away, it would be locked up; and if she tapped on the door with her knuckles, there would be a dull sound instead of a hollow, echoing noise.
She ran quickly down, and the door was locked.
She tapped with her knuckles, and the sound indicated that the place was full, for all was dull and heavy and no reverberation in the place.
"I must have dreamed it all," she cried joyously.

"I have thought so much about it that I have fancied all this, and made myself ill.

Why, of course he could not have got in there to watch or the men would have seen him come." It is very easy to place faith in that which you wish to believe..