I'm sorry for saying it, but... Factory Sealed! With a tiny bit of creativity, you can put a coin in larger than the mouth of the bottle and have the bottle ACTUALLY factory sealed- not to mention examinable.
However, any CIB you buy should be supplemented by Abyss (Revolutionary, not the other version!) because it contains so many good ideas for cleanup, setup, and performance- "Waterfall", I think, is worth the price of the book.