I had new panels from day one last year and they didn't come with the aluminum or foam either. After a full season of riding and laying it over on that side hundreds of times per ride there was not even so much as an inclination that the panel was being affected.
Oh and I did have the stock can, not sure if that matters or not.
I put a little melty spot on the inside my side panel without the shield or heat resistant material. There doesn't seem to be imminent doom with a stock can but there is a slight added risk.
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