I believe, athough not 100% sure, that you can see this using the "refund route". Go to the refunds page, and start as if requesting a refund. You'll have a final confirmation that you won't agree to...before that, you'll get to see information about your reservation, including upgrades. I can't guarantee that this is the eVIP number, but I have seen numbers in the res when I've done this.

Cheers.