for once i agree with quadrille . This always happens with out of the box e-commerce sites.
The chances are that your content pages (your 1500 pages you mention) are product/category pages? Each one will be near identical, and have little or nothing to distinguish it from any of the other 1500. This is bad for search engines as they want to see good plentiful unique content, not just masses of repeated pages with the odd word change here and there, or with hardly any formatted natural text.
The chances are your pages (or some of them anyway) are in the supplemental index, which means they have been indexed but have been given a very low priority, as quite simply, they're classed as boring or they're all too similar. Most of them will be being treated as a duplicate of another page.
This is probably why your policy page is being indexed... it has some content and some nice paragraphs to look at ! and its different from your other pages.
Give your pages some content, some descriptive paragraphs or two for example.. and make sure each one is as unique as you can make it. Then get some good navigation to your main categories, and see what happens.
Sitemaps (xml) are just guides for the search engines to tell them the pages exist, its has nothing to do with how well they're indexed or returned.
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