Another question on buying in quantity.... Rats/mice come vacuum-sealed in packs of 10-20-25 etc. based on size. So let's say I get 25 rat pups in a pack that's "vacuum-sealed" to preserve freshness. I have to break the seal to get the rats out for feeding one by one (they're not individually sealed apparently ). I wouldn't keep a steak in the freezer for half a year...won't the rats at the back end of the "25 week package" be a little dried out/lack freshness when they're finally used for feeding? How do you keep remaining frozen feeders fresh once the seal's broken on the original packaging, or shouldn't I worry about it (?) Hope this makes sense......