While cleaning out my pantry, I found numerous packages of candy melts and almond bark. Most are unopened; those that have been opened are sealed in a Ziplock bag. None of the packages have a "best by" or "use by" date. Anyone know how long these last? They've got to be at least 5 years old. I don't even remember why I bought them, other than the almond bark (maybe for mixed chocolate peanut clusters???). Should I keep or pitch?