Lithonia Ameri-Can had the sticker that you removed to make it IC. I don't quite understand why, it was basically an IC can which can always be used in non-IC situations. The new Lithonias don't have the sticker.
Larry that is an alternative but it is also a violation of the energy codes in many places and also shoddy work in my veiw. I don't think I'd want my heat or a/c going into the attic.
Only shoddy if done in a shoddy manner. You have to get a little more insulation to "tuck" it all in, just like when you put your kid to bed. Make it all cozy.