If you really are an insurance agent, then you should know that Allstate no longer ensures homeowner's insurance. 😉 At any rate, typically losses <$750 are "overlooked" and simply considered insignificant.
As for purchase w/ CC coverage, I really don't know about AmEx, but my Visa only extends the manufacturer's warranty such that, if the original warranty does NOT cover accidental damage, neither would Visa's program.