Since Grandcentral is going to be shutdown at the end of the month I'd though I'd download all of my voicemails while I had the chance.
This is messy and *nix oriented.
1) Download the HTML for each page of the inbox. For this example name them 1.html, 2.html, etc..
2) Extract the message IDs with the following snippet for each file
grep mhash 1.html
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