It's included because it was a valid license when bought and is still valid. You can still use EOS devices beyond EOS. Just because you've wisely chosen not to doesn't invalidate the license.
You will renew when your expiration date happens, at that renewal, you would only renew what you actively use and when you process the renewal the licenses for those unused devices will no longer appear in your license calculation.
Do be aware, as a co-term org, you are able to migrate those MX60 license to MX64s and then to MX67s. See license conversion on the previously linked document. You may have to open two cases to do this, once to 64 and then to 67, but it should work. So you could have some use for them down the road.
If you found this post helpful, please give it Kudos. If my answer solves your problem please click Accept as Solution so others can benefit from it.