If you validated at 50K or above, you are entitled to a free book from CreateSpace.com.
Go get your code now--and write it into some calendar in your house so that you remember to get your free book (and free shipping.)
You do not have to order your book right now. But, if you aren't planning on doing anything with it ever again, then why wait? If you plan on editing, good for you. Work on your novel, and wait to order your copy, but don't forget to get your free book.
I always put June 1st into my calendar so that when the date comes up, I still have time for a last minute look-through, or major edit, or picking a cover, or creating an account with CreateSpace, or whatever it is that's left to do. The code is good until the end of June, but aim to order the book around June 1st and you won't inadvertently miss the deadline.
Get your free book. It's really neat to have.----------