Why book ends?

Those dodgy looking book ends came in the mail today.

They're from Australia Post.

You're probably wondering why they sent them.

I'm really not sure to be honest. Especially after reading the info below which was enclosed with the book ends.

"Make some room on your shelf. And in your diary. Set aside 45 minutes for an enlightening presentation to you and other key members of your team. Then wait for our call."

Umm. Yeah. Whatever!