NCL doesn't always send out e-docs. Sometimes, you have to get them yourself. Go to ncl.com, and click on the passport on the lower right. On the next page that opens, there's an area in the middle for online registration and e-docs. You may be able to click on e-docs. If not, try this link. You'll need to have your reservation number handy.
Thanks Lisa--I got them with your link. I was under the impression per the NCL website that they would e-mail them to me directly, but that was not the case! Oh well, it's done now!