findpacnews.sh

#!/bin/bash

check_backup() {
  [[ -f $1 ]] && echo "$1"
}

awk '/^%BACKUP%$/ {
  while (getline) {
    if (/^$/) { nextfile }
    print $1
  }
}' /var/lib/pacman/local/*/files | while read -r bkup; do
  check_backup "/$bkup.pacnew"
  check_backup "/$bkup.pacorig"
  check_backup "/$bkup.pacsave"
done