Storage: Store preserved black truffle slices in a cupboard until you open them, then keep them in an air-tight container in the refrigerator.
Shelf Life: Once opened, preserved truffles will keep in the refrigerator for up to two weeks.

Because preserved truffles tend to be extremely mild in flavor, they are often used only for appearance's stake and paired with other truffle products like truffle oils and truffle salts to amp up the dish's overall truffle flavor.
Truffle Recipes