If a party chose to sign by hand, you can use the function mark as signed to indicate that the party has signed by hand. You find the function on each party's menu when you're looking at the case.
Once the case has been finished the receipt page will show that the party has signed by hand, and that you as the issuer has confirmed that you've received a signature on paper.
NOTE. This functionality is not activated on all account plans. Contact us and we'll help you get started!