CD Security Case Key?

Hello,

Long ago we developed a collection of classical music CDs.  Each CD lives inside a security case.  Unfortunately, this collection has not been used in years, and as a result, the key that unlocks the CD security cases has gone missing.  Does anyone recognize this brand of security case? (See pictures below.)  Does anyone know if replacement keys can be purchased?  Also, if anyone is interested in classical music CDs, we are happy to donate this collection of approximately 90 CDS...but we need the key to get the cases off!

Thanks,

Michael