Wonder whatever happened to that old boy.
4 seconds sound clip from the The Train Robbers movie soundboard.
You can hear this line at 00:48:32 in the Blu-ray version of the movie.
Quote context
[...]
- You wouldn't catch me hiding that much gold in the boiler of a six-wheeler!
- I'll believe that when I see it.
- Wonder whatever happened to that old boy.
[...]