You can go to the ‘Seminar’ tab and you will see your license numbers attached to the folders (See Figure 1 below)
If you have changed the name of the folder (this is possible) then I am not sure how we would know the number of the license for sure, but you can find out the information (seats etc.) for the license by clicking on the folder and then ‘License Info’. I expect that if you mouse-over the folder the ‘sco-id’ shown in the browser will be the correct license number too
Figure 1
Figure 2