I had the same problem with an NEF when I moved from TX to FL. I'm sure having it packed in a U-haul for 3 days didn't help. If you do see any rust hit it ASAP with a little 000 steel wool. Anything that repels water will work. The ones you mentioned will work fine, however one of the best that I have found is Tuf Glide and Tuf Cloth. It was developed for the military spec ops and will withsttand temperature extremes from several hundred degrees to much below freezing. Best of all it contains no silicones. I have heard what it actually is but I don't remember. I use it on all my guns and knives. Note: i had not treated the NEF before packing it. All it takes is a quick rub and thats it. Nothing to wipe off or stain your gun cases. I have used the same cloth for years. It comes in it's own resealable bag and has kept mine fresh all this time. Check it out.