I just rang up Universal customer services on : 0870 590 0909
to ask what to do about this, they said if you dont have a reciept, photocopy the cover of the box set and discs and send it with a letter to the following address:
Customer Services, Universal Music
Chippenham Drive, Kingston
Milton Keynes, Bucks, MK10 0AT, England
and they will send out a replacement.
I hope this helps
regarRAB
Lawyer