Should I Empty Vintage Boxes?

I just ran into some old vintage boxes the other day & I didn't pick them up, because some of them were partially open & basically still full. I wish I had seen this article from Antiques Roadshow.

Click here to read the Full Article

 So it basically says to make sure that you empty them if they are already open, have holes or leaks.  Otherwise, if they are perfectly sealed, it's fine to just leave them as they are.
Another good point they made in the article was to add some structural support to the inside of the box to help it keep it's shape.