I got a reply from Amazon:
Greetings from Amazon.com.
Thank you for alerting us to the disappearance of reviews. Our
customer review database has been undergoing some minor
infrastructure modifications, and it is possible that your review is
linked with the changes.
We would appreciate it if you could provide us the ISBN or ASIN of
the item reviewed (the 10-digit number on the item's detail page).
This information will assist us in our research and will hopefully
help us recover reviews.
Please visit the following link to provide the information we
Please be aware that customer reviews are typically only removed
from the Amazon.com website for two reasons. The first being if the
review was not within our posted guidelines. The second is at the
request of the customer who authored the review in question. Please
note, customers who submit reviews have the option to edit or delete
their own comments online at any time.
Due to our strict customer confidentiality and account security
policy any review removal will be discussed only with the person who
wrote the review. I hope you will understand the importance of our
security measures despite any disappointment this may cause.
Please take a look at our Review and Participation Guidelines for
information about acceptable review content:http://www.amazon.com/gp/help/custom...odeId=14279631
Thank you for your interest in Amazon.com.
Please let us know if this e-mail resolved your question:
If yes, click here:http://www.amazon.com/rsvp-y?c=bvwwvqxa3238729789
If not, click here:http://www.amazon.com/rsvp-n?c=bvwwv...&q=hcm2&nc2c=1
Please note: this e-mail was sent from an address that cannot accept
To contact us about an unrelated issue, please visit the Help
section of our web site.
Amazon.com Customer Servicehttp://www.amazon.com
Check your order and more: http://www.amazon.com/your-account