Hi James,
I suggest you canonical the duplicate pages rather than 301 redirect them. Using canonical tags instead of 301 redirects will allow you to preserve any incoming link equity from external links to those pages. With a 301 redirect, you'll lose that equity.
David may have run your site through Open Site Explorer (OSE) and seen that there's very few incoming links to the duplicate pages and therefore felt it unnecessary to canonicalize them. I see only 8 from the example you gave us above, but don’t want to assume that’s all there is, especially when you're saying you see duplicates on the site, If you have webmaster tools set up, you can get a more exhaustive list of incoming links there.
The other thing I noticed is that the incoming links to the sample pages are coming from a cryopak subdomain on another site. Here are the ones I can see using OSE.
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http://cryopak.spydertrapdev.com/product_line/default.aspx?DepartmentId=25
http://cryopak.spydertrapdev.com/product_line/default.aspx?DepartmentId=4
http://cryopak.spydertrapdev.com/product_line/default.aspx?DepartmentId=66
http://cryopak.spydertrapdev.com/product_line/default.aspx?DepartmentId=67
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I get an error when I try to look at spydertrapdev.com so can't tell if that's a development environment that's been set up for your site or what. These may not be links you want to maintain. You’ll have to decide.
Good luck.
Donna