AlanRatcliffe I've replaced all mine over the last few years. Particularly with the older plywood ones, if they start coming apart I replace them asap. These days we have the packing order well sorted out, so they never get much abuse in transit.
vic You have some nice cases there guys. Saw this one the other day.....beautifully aged...BUT check the PRICE ! ? http://www.ebay.com/itm/1950s-Gibson-Lifton-Hardshell-Case-Les-Paul-NOT-Reissue-/160730323628?pt=Guitar_Accessories&hash=item256c461aac