I've run out of boxes, so I'm using plastic wrap left over from the summer we moved the entire collection to the gym so that the media center could be recarpeted (2004?)
I wish I would have documented that process because I thought it was rather clever. First, I naumbered and labeled all the shelves. Then as we wrapped sections in plastic (usually two per 3 foot shelf), we labeled them A and B to with the number.
When the carpet was installed and the shelves moved back, we just had to match up the plastic bundles with the shelf numbers and everything stayed in order.