If the package was properly sealed in the correct freezer bags for the foodsaver and never opened then perhaps but realistically I'd go with 1 year for rodents that are fully furred, 6 months for rodents that are pinks. That depends though on proper resealing everytime the package is opened. I'd also recommend you get some disposable cookie sheets and lay out the rodents first to start to freeze them before packing them into the foodsaver bags. That way once they fully freeze they won't stick together and you can easily remove one at a time. Don't forget to label the bags.