Heck my girl tonight surprised me with a big ole turd. This is surprising because she hasn't eaten anything for around 2 months. She's a pretty healthy girl too so I haven't bothered to weigh her. I personally wouldn't worry unless you start to see him losing lots of weight. You would be surprised how hardy snakes are in reality. And I also would cut the food trying down to once every 2 weeks to once a month. I generally do every 2 weeks to 1 month as that's the timeframe my boas eat so I just buy 1 small rat and see if she wants it, if not, my sunglow gets it.