Polycarbonate (“Lexan” et al) is pretty flexible compared to glass. It’s also really expensive in thicknesses that don’t flex appreciably. You can get it with a scratch-resistant coating but it’s even more expensive. Putting a layer of 12mil or 15mil polyester security film on the inside surface would help the glass as a barrier but would need to be edge anchored to the showcase frame to keep it from collapsing into the showcase when broken.
One of the would-be thieves left their backpack behind. Add the bruises to the criminal group from the melee and it comes across as a bad investment of their time and money (balaclavas and hammers).
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