Proposition 65 Warning for Styrene and BPA in Toaster Oven

I recently purchased a Black and Decker Toaster oven, model TO3290XSD, online to replace our old one which is severely rusted and not functioning well. When the box was delivered I noticed a warning that read as follows: WARNING: This product can expose you to chemicals including Styrene, which known to the State of California to cause cancer, and Bisphenol-A, which is known to the State of California to casue birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov. I went to the website and there is a list of chemical and their potential adverse effects but no explanation of how exactly the particular product in question would expose a person so such chemicals or how such chemicals are incorporated into the product.