I agree with kddani and JonInKC start looking for another job immediately. It's easier to switch jobs when you have one. Ask your former manager if you can use her as a reference. Why are you settling for a job where you are doing the work of two people and you're only getting the salary of one?
If you do work for a national chain, I highly recommend you go over your boss's head and contact your district manager confidentially if a 1800 number is not a option. I hope the other tills are consistently off for your sake. If not, it sounds like someone is trying to set you up to get fired for theft. It already sounds like your current boss might take the sticky fingered bookeeper's word over yours.
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