Robert_Charlton - 9:59 pm on Dec 27, 2010 (gmt 0)
Without having checked this out thoroughly, but based on what I already understand about how Google looks at third party references... I'd say that you should ask the customers to re-post the reviews.
Google is going to want different people with different Google accounts posting from different IPs. Otherwise, reviews would be very easy to spam.
If you're already using the reviews in your site's Testomonial section, I'd suggest also getting unique wording on the newly posted reviews... perhaps even some additional or different customers posting. In its link patents, Google looks at coordinated actions as a sign of manipulation or spam. I know Google ignores or reduces the weighting of links with duplicate descriptions. You don't want that to happen with your reviews, which aren't links, but which, like links, are references.
Again, the above is speculation... not based on experience submitting multiple reviews to a single Place Page, but it is based on my sense of Google in general, and on my seeing the kinds of checks that Google is placing on Hotpot submissions in particular.