The member dashboard notification is a sidebar that looks like this:
And when they click-through to the title details page, they see this right above the download buttons:
This is the email that members receive when their wish has been granted:
Subject Line: Wishes do come true! [book title] now available for you
It's your lucky day! You wished for [book title], and you have been randomly selected to receive this book on NetGalley. Sign in right now to start reading, and please share your feedback and review via NetGalley.
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We hope you enjoy this book.