A shelf caption repeats the heading already visible on a public screen, and it prints the calendar day of that reading. When the heading is missing, the page says absent.
The heading has to be on the screen on the day it is read. The office copies those words and that day. It does not add a guess about a later decision by the store. When the day had no heading, the page says absent. It does not leave a blank, and it does not fill the blank with an older heading. Star counts, download totals, and revenue stay off this page.