I actually have a real issue with "nut bans" in school. Here are a few of my reasons:
1. Telling people they can't have something because of a few is antagonistic to many parents and uncomfortable for the school.
2. Once a ban is in place, much of the effort and energy of the school goes into enforcing the ban, instead of educating the public about the allergy.
3.There are other life-threatening triggers such as milk, wheat or eggs, which would be impossible to ban. Where do you stop?
4. No school can ever be completely nut-free. Unless you plan to pat down everyone who walks theru the door. Even then, kids could have had peanut butter at breakfast, and still have it on their hands when arriving, thus touching dorrknobs etc., with the peanuts.
5. Kids need to be taught their own responsibility in managing their allergy, just like an asthmatic or diabetic child. They need to be continually reminded not to eat other's food, and possibly sit at a peanut-free table at lunch.
6. The latest research states that only approx 1.4% of children are truly (anaphylactically) allergic to peanuts. We have a lot of parents overreacting about whether their child has a true allergy, or perhaps just an intolerance to peanuts, which are two entirely different things.
7."Peanut/nut-free" gives everyone a feeling of false security, which in turn encourages complacency in the school about dealing with life-threatening allergies.
And before anyone goes crazy about my post, let me just say that I have a peanut-allergic child. He carries his EpiPen everywhere he goes. He has been taught and reminded constantly about his allergy and what to avoid. He has a bag of peanut free snacks at school for the times that treats are brought in that are homemade. I would NEVER ask my child's school to ban peanuts for the few who are allergic. Before you know it, we'll be banning milk, soy, eggs, etc. When will it stop. Knowledge is power.
To answer your question, make you box mix, and put a note on the container, letting the teacher know that you can't garauntee that it's peanut free, for whom that affects. Knowledge is power.