Yes you do. When you process electronic delivery items, you will see the items that show up in NO ILL Number Match. These are electronic articles that do not match up to an ILLiad Transaction and thus will not show up in Awaiting Odyssey Processing.
For example, the National Library of Medicine will send articles and they will show up in NO ILL Number Match always. They use a program that will not match up to an ILLiad Transaction Number. When you process Electronic Delivery, you will match up the incoming article to a Transaction Number and then be able to deliver the article.