you can import your records with use this extension : http://zev.ez.no/svn/extensions/csv/
You have to export first your 1500 records in csv format and after use this extension to add them in your ez site.
You just have to configure correctly it and it's work very well !
If you want have more information about his extension, look at this post : http://ez.no/content/view/full/84161
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