According to this, I am set up to receive email notifications, but don't get any on order delivered, only on communication with other sellers and order updates and order confirmed.

Here's a thought.

Given that eBay don't deliver anything that might be the reason.

If a seller sends with tracking, you have the information to determine whether it's been delivered. 

OR, you could look at what you have received and work out if it's been delivered.

I started getting them again when I updated my address directions. The main roads department had taken down the signage on our service road, resulting in delivery delays. That problem is fixed. To those who replied about getting order delivered notifications being uncommon, most everything I order has notifications of order accepted, order sent or order delivered, normatively speaking. I don't know why some customers don't normally get them.