I agree, get the proper paperwork. You don't want to get prosecuted under the fucking Patriot Act or some shit. It doesn't matter how non-explosive it may be, you never know how these numb nut feds are going to react over anything that is even very flammable. One time I was mailing something and they read the standard list and ask if anything was flammable. I told them that paper was flammable, so technically the envelopes would be restricted. Bitch didn't think it was funny and said, "We mean really flammable". I just apologized for the lame joke and left.