The money would have then to be dealt specially with.

Very specially.

We'd have perhaps to lose more than half the amount in order to get these notes changed in a certain safe place I know of in Paris.

In the other case I mean if he had his account and got paid out under some other name--say Smith, for instance--the money is perfectly safe to use.

You understand?
The bank has no means of knowing that Mr Verloc and, say, Smith are one and the same person.