Decals are not provided by the FAA, nor will they be mailed to you free of charge. They don't do that when you get your "N" number either with your 333 exemption. UAS Marking information can be found
HERE or see the
FAQ HERE "You may use any method to affix the number, such as permanent marker, label, engraving, or other means, as long as the number is readily accessible and maintained in a condition that is readable and legible upon close visual inspection. If your unmanned aircraft has an easily accessible battery compartment you may affix the number in that compartment."
Sorry for multiple posts, just getting the word out.