I think 6 months is if they're just in ziplock bags, being taken out as needed... I imagine that as with people-food, prey items in better preserving conditions will last longer. I think ziplocked prey items "go off" because of freezerburn, but it does depend on the conditions of the freezer - humidity, temperature, quality of the plastic you've got them vacuumed/bagged in, etc - so your millage may vary!If the snek still tek, feed the food. Snek will tell you if it's no good!