There had been recent reports in Google Groups for Maps and elsewhere of review gone missing.
Intrepid Maps Guide Jen reports today that they have been found:
The Maps team implemented a fix for your listing (and others that were
similarly losing reviews). You should find that they are now all appearing.
Let us know if you notice anything amiss!
Please consider leaving a comment as your input will help me (& everyone else) better understand and learn about local.
Google Maps missing reviews returned to rightful owners
by Mike Blumenthal
[...] – 5:00 am Google continues having technical issues with losing reviews (here is my first report of them being lost from August 2008 so the issue goes back quite a ways) particularly when the [...]