[LEAKYSEALS951]

Honda guarantees the first start regardless.

Ethanol will probably do more harm than the year of storage most likely ever would.

If it doesn't have oil, it was never started, so the assembly lube is probably still there. I see 40+ year old garden tractor engines NOS go up for sale all the time. Any rust on the inside of a new tank is less than the rust on a used older tank. Most older used tanks look like the hold of a sunken ship, if not pin hole rusted through. Yours will be fine.

edit- another clue... yours are in a box. Is the cardboard rotted away? If not, the engine has been exposed to less moisture than the amount needed to mess up cardboard. The NOS kohlers I see are unpainted raw, never came in a box, and have sat on a shelf since Carter was president, perhaps even Nixon. Light surface rust if anything.