Store wild boar bellies in your freezer until you're ready to cook them.
For thawing tips, read Safely Defrosting Food for Maximum Flavor.

Wild boar bellies are delicious slow-braised in a rich, flavorful braising liquid. They can also be roasted on a bed of your favorite root vegetables.
How to Braise Meats
Braising Liquid Recipes
For even more delicious and moist results, brine them prior to cooking (brining meat tutorial and brine recipe).
Wild boar meat pairs well with rich, fruity flavors like red wine, prunes, brandy, and apples. Herbs and spices frequently used with wild boar include rosemary, thyme, and the always game meat friendly juniper berries.
You can also cure and smoke these wild boar bellies yourself for some delicious homemade wild boar bacon.
Pork & Wild Boar Belly Recipes
Recommended Cooking Temps:
The USDA recommends that all wild-caught game be cooked to an internal temperature of 165 degrees.