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Some Walmart employees say customers are getting hostile at self-checkout — and they blame anti-theft tech
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
It's unethical and I personally wouldn't do that...
...but in your situation practically speaking, if no one's going to come and fix the machine in that amount of time, then who would be there to stop you just walking out with your goods?