|For a definite answer to your query, perhaps call or email NotRot.
I have the Jurat stamp from here and it does have the disclaimer box and signature line. Got this stamp several years ago. The depiction of the printed Acknowledgement and Jurat forms here include the disclaimer box so I would assume (yeah, I know) that the stamp is complete with all required elements.
Contacting NR directly may be quicker than waiting for a fellow NSA to respond. Forum has been rather lethargic lately.