Connie, No, you cannot boil roasted peanuts. Well, you can boil them, but they will not taste like boiled peanuts. They will taste like wet soft roasted peanuts.
Only raw peanuts can be boiled. Dried raw peanuts are available year round at grocery stores, health food stores, and online nutsellers. Asian markets often have raw peanuts.
Chinese braised peanuts are typically boiled already shelled. I often find shelled raw Spanish peanuts available this time of year at grocery stores. They are commonly used to make peanut brittle. Some stores sell blanched raw peanuts in the bulk section.
Ingredients for fragrant braised peanuts include combinations of star anise, cinnamon stick, 5 spice (ground fennel, anise, ginger, cinnamon, cloves), salt, sugar, dark soy sauce, light soy sauce, garlic, oyster sauce, orange peel, Szechuan peppercorns, chili peppers and other spices. Use spices that you like, and have available.
Cover the raw peanuts with water, add your chosen spices, and bring to a boil. Turn the heat down, and let them simmer until they reach the texture you prefer. Let them soak in the cooling juice to intensify the flavors. The flavors will also become more concentrated as the juice reduces due to the water boiling off.