Unless for some strange reason those rats were poisoned (highly doubt any business would be that careless), sounds more like you had a long term problem that spread to your collection and the feeding was simply coincidence. You could have possibly contracted parasites but that would take time to develop into a problem and you would have noticed issues like your snakes not gaining weight. You could have kept them in substandard conditions that eventually compromised their immune systems. You could have not quarantined properly and spread a virus across your collection.
What I am getting at is exactly what others have said, you have no evidence your snakes died from eating live prey and without a vet diagnosing this issue, you can't point toward live prey and the vendor that sold them to you.
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