Manage my subscription, remove a license.

I have a 5 user NIS subscription with all licences used.

I have over 200 days remaining.

I want to remove one of the licenses from one of my laptops, as it has become faulty and inaccessible, and apply it to another.

The problem is on my manage subscription screen its impossible to tell which of the 5 PCs shown, which is the one i need to remove.

All are labeled with my first name then windows 7 and a number 1 to 5.

All show offline at all times and this doesn`t change even if i sign in on each licence.

Without removing each one in turn until i find the right one, what can i do?