I agree, if rusting is a problem, roll them up in an oil soaked cloth. I like gun oil or mineral oil. Organic based oils can go rancid, whereas the ones I mentioned will not. Motor oil will work, but gun or mineral oil are better for your contact. To remove rust, you could wire brush or better yet wire wheel and polish them. A light wire wheel will help to burnish a patina if that is what you want. A more aggressive method would be glass bead blasting. You might find an auto shop that has a glass bead blasting cabinet. I'd still wire wheel it after that to polish closed some of the metal grain. Freshly blasted will rust the most quickly, whereas polished much slower. I usually keep my chisels in leather sheaths, but there is also some residual oil in the sheaths from it being applied to the chisel.