You did the right thing by contacting the manufacturer and y saving the can and product.
Hopefully you do not become ill as a result of this. If you do not get sick, I do not think that any type of formal legal action would be worth pursuing. However, this does not preclude you from trying to settle directly wit hteh company.
A claim for negligence requires damages that luckily you did not suffer. You may get a coupon or free product from the company if you write a letter and enclose the object found in the product.
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