Karen -
Jeffray makes a good point about refrigeration. In my experience, it's best to use the freshest berries you can get and then keep them at room temp if you can. I try never to buy further in advance than the day before (or Friday for weekend festivals). I rinse the berries in cool water and place them on a towel, then dry the berry usinglint-free microfiber cloths. I don't worry about getting the leaves/stems perfectly dry. If I have to worry about longevity, I use gel packs in rack a large cooler and don't put the berries in a refrigerator.
When it comes to the dipping in chocolate part the berries need to perfectly dry. I also use lint-free microfiber cloths here.
I have spent many weekends at various festivals with a pair of Chocovision Rev2s dipping hundreds and hundreds of strawberries and dried apricots garnished with slices of candied ginger (and don't forget pretzels sticks for the kids).
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@DiscoverChoc