The boxed version comes with the most annoying product packaging ever. You won't miss a thing.
If you go with the electronic download, be sure to get all the necessary files, and also burn them to DVD's for backup, in case of a crash. I'd also make sure to include a copy of all of the S/N's.
Now, unlike Colin, I will overlook the packaging, just because I like having my media.
Hey, I tolerated that inane graphic for Corel Painter 9, and still use that program - just goofy artwork, and I was not alone in that assessment.
Here are instructions for downloading the additional content for Encore. The instructions are essentially the same for the title templates and such for Premiere Pro.
BTW, I am compelled to interject this: Be sure to update your software as soon as you install it.