Ah-ha, but I know the last verse! On account of we sang an a capella version in my high school choir using the first and last verse. Granted, I sang mostly "doodoodoo" but we still had to learn some of the words
"And there's a hand my trusty fiere
And gie's a hand o' thine
We'll tak a cup o' kindness yet
For the sake auld lang syne"
Actually, here's a video: Palatine High School Concert Choir- Auld Lang Syne - YouTube