It turns out this Office.com pleading template places both the vertical lines and the numbers in the header section of the document. Even though the lines and numbers run down the side of the page and are not what one would ordinarily think of as header elements, to edit them you have to edit the header.

The trick was to click on the header in the last page of the document, which opens up the header and footers tab. I unselected the "link to previous" option under Header and Footers Tools|Navigation. Then I could go in and delete the lines and numbers affecting the last page only.

My question might just as well have been "How do you delete the header for the last page of the document only?" I don't believe the template utilizes the line numbering feature or the border feature of Word to create the lines and numbers. The numbers were in a text box and the lines were called autoshapes.

Thanks for the suggestions, everyone.