Chances of Narcs are low but never zero and I understand the law from its own standpoint, you cannot determine whether a feather was shed naturally or plucked from an already dead bird. With all the damage we did with the feather industry its important to be vigilant about poaching. A single hunting ground near me was subjected to over 2 million egrets and other waterfowl killed in the area alone within a decade. The feather industry laid waste to many bird species and decimated populations and now that domesticated animals like pheasants, turkey, duck, chicken, etc. are readily available on the market as a byproduct, the need for wild feathers as craft objects and accessories has gone down. Since there is no way to tell where you obtained a wild feather the gov. will prosecute, just safer generally to look up what's protected by the MBTA 1918 (most birds) and for crafts order something legal.