I found a mouse in my 16oz. aluminum bottle of Budweiser

Foreign substances in food cases are difficult to pursue and win. Insurance companies are highly suspicious of these claims because more often than not, people make fraudulent claims in an attempt to collect money from the insurance company. Certainly in your case, a dead mouse in a beer bottle is disgusting and enough to make anyone sick over. You don't really state whether you actually got sick over it, vomited, had to go to the hospital or have any other symptoms at this point. Therefore, without any sustainable damages, the case has little or not value to it from a legal perspective. The best you can do is document it for the company and get some free coupons (like you have stated) for some additional beer in the future. I am sure Budweiser doesn't want the publicity of your having found a dead mouse in one of their products.  If you decide to pursue the case legally in any way, the statute of limitations in WI is three years to sue for injury from the date of the occurence, or your claim would be forever barred.