Your Wagtail isnt ruined, I hope you didnt throw it away.
Boil some water and hold that bait in there, up to the eyes, for a minute or so. Then submerse the bait in cool tap water and the plastic should correct itself.
For your box situation, go to Tackle Warehouse and look for Markey's swimbait boxes. Cheapest option for you. There are some specialty boxes (typically designed for musky fishing) that will cost you an arm and a leg, but are worth it if you have the baits to fill them.