No access to old computers - how to deauthorize iTunes??

I would like to authorize my new computer to play songs I've purchased off iTunes, but I've already authorized 5 computers since I opened my account... probably about 4 years ago. I have two computers I use regularly, but others are either not working, or have been returned to my employer.

How else can I deauthorize these computers so I can authorize my new one?
 
sad I’m frustrated!!!
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