I got a reply back from Microsoft on this issue, and I've pasted their reply below. Hopefully, this will help.
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The customer can reorder the media using the following number…
They should be able to order E5.5 CDs from their Msft reseller.
312-01981 Microsoft® Exchange Server Standard 5.5 English Disk Kit Microsoft Volume License CD MLF
Source:Available for purchase separately
Product Type

Product Family:Exchange Server - Standard
Product Pool:Servers
Operating System:Win NT
Media:CD
Version:5.50
Language:English
Release Date:N/A
This number is just for replacement of the media not the product itself according to our marketing folks.
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