S.H.
It is up to you.
But always remember how he came to be in your home.
And that, each family/child, will have a different story of it.
And when they are older, they may compare stories.
And some kids have an Elf. Some don't.
etc. so you may have to explain 'why' IF your kids ask that.
Ours, just showed up. And with the book.
Wow!
Then my daughter says "I saw this at Barnes & Noble....."
I say yes.
But, I didn't buy it. It just showed up!
But that some people do buy it.
It comes in different ways....
Ya gotta think on your toes...