Make your publication special!  While there are many ways to accomplish this, one way is to number each book of your publication.  The easiest way to do this is to place a notation such as “First Edition, ___________ of 50” somewhere in the fore pages.  When the books arrive, you number the blank and, if so inclined, sign the book.  Another way to do this is to commission a particular numbered page go in each book.  Such as with a run of 100, there would be 100 different title pages each saying a different number of 100.  This can run into some additional expense if the “one of” pages are mechanically destroyed during the publication process.  With our process, the page can be replaced if destroyed.  However, the further along in the process it is when it gets destroyed means either a) more expense replacing it or b) that number would not exist.