Bests & Worsts Reviews from Amazon

I am updating my previous review from a 5 to a 1. These magnets work great BUT after using them for about a year the plastic is now split away from the magnets and I am afraid that they may eventually rust. Lifetime warranty? What a joke, you have to send the magnets back in the original box, who the heck saves their boxes? You also need a dated receipt, which you all know if you buy from Amazon many times you don't get on. though I suppose you can send in a purchase history. You also have to include $9.95 s/h, and the warranty info. Really disappointed because I love these things and have even given some away as gifts.