I agree with Raider. In my experience, the "hidden" stashes are the ones that were forgotten, most of what was drunk got spirited out of the house in the trash, in a coat, duffle bag or whatever. You are assuming that what you found is what he drank. That may be the case, but this alcoholic was fond of pleading guilty to a lesser charge: accepting guilt for what is found and allowing the accuser to think that the case is closed when in fact, I had drank more, done worse than I admitted to, etc.
Cross addiction is really common - if you are not fully familiar with it, please google and read the articles on it. You might be correct that your husband is not an alcoholic, but are you willing to bet his life and your future on it?