These instances are just a shame.
When books are sent in and payment has been made, don't we have a contract with cgc? Is it the comic owner's responsibility to ensure cgc honors the contract?
Why should the books TRUE owner, have to worry about what insurance cgc has or does not have on various carriers? Isn't it up to the sender to get the book to the owner, and not the other way around? And since the carrier is responsible to deliver the package to the TRUE owner, it seems the issue lies between cgc and the shipper. I feel that the owner is just a third, albeit concerned party in cases like these, with little authority or muscle to make things happen.
Mistakes happen of course, and we've all been taken advantage of one time or another by grading company or shipper. I hate being brought into a scenario like this, where the greatest company in the world can't get a book delivered as required, as contracted.
If the book is important to me, it is Signatures all the way, with full insurance, until it arrives at its assigned destination. Other than that, it's up to someone else.
Good luck.