How do you get the last of the salt out of a cylindrical Morton's box?

Do you bother with it, or do you routinely toss the box out not quite empty?

Sometimes I keep shaking it and rotating it, trying to get the last few grains out through the opening, and sometimes I just cut a hole in the box.

Do you have a better trick?

 
I like the fact that a Morton’s Salt box is basically unchanged since I was a little girl, design and label and all. When it works, why mess with it?