The original sense of conveyance was a document that transferred ownership from one person to another. It is interesting that language has shifted the sense from the document to the movement.
Now a conveyance suggests some transportation. Something as still and inert as a piece of paper can become a moving object.
Also – it is quite extraordinary how many pieces of paper, how many documents a person can acquire in his or her life. If you had to take them with you to the grave, there would be no room for you in it.
The Hamlet Project 