Here is an alternative to risking the book. Set a deadline and have anyone who hasn't signed yet, send in a couple of photos of themselves with their Cobra and sign the pix. Include them with the book. Not as cool, but no risk of losing the book. Just a thought.
I would like to sign it, but there is a risk every time it is in the mail.
I haven't been on the site as long as many of the others, I would say to do what is best.