We've created this Forum Thread with some workarounds and advice to assist you in publishing you ebook.
Lulu delivery printed insert
Top right hand corner is an 'Internal use' only box. One of the items in it is 'Checked for Quality by:' It is not signed. It would look far better if it is signed, even if a printed signature has to be resorted to.
Interestingly at the very bottom it says 'Printed, bound, and packed with care at Lulu.com. Lulu themselves do not do any of those do they?