This Cox J3 Cub appears to be new and unused.  There's some brown residue around the engine...the tank is very clean so I'm not sure it's ever been run.  Sometimes residue in kits is from fuel accessories that have been removed from the box.  I have another model that has the original fuel/battery combo (not this listing) that has similar residue mat likely from leaked fuel.  The engine and fuel cell look new and unused.  There are no good rubberbands as  they had all dry rotted.  In nice condition overall but could use some cleaning.