I got shipping confirmation about a day after. I've seen the photos of the white packaging for it - looks like this:
Like you both mentioned, I always like to leave things sealed, but usually that's for shrink wrap, etc, and not 'packaging' per se. At least with shrink wrap (like the Rapture Record from Bio 2), you can still see the item. It'd annoy me to not be able to see the book at all. And like you, I must know what number it is! In fact, I'm still skeptical that they've sent me a signed one at all and I'll always have that doubt unless I see it for myself. I'll keep the packaging as well and display it with the order confirmation as mentioned already.
Actually, as I ended up buying two of these (one signed and one unsigned), I think I'll keep the unsigned one sealed and then I can display them together that way. Decisions, decisions!
It is a shame to have no certificate of authenticity - it's not mentioned so I doubt there will be one. I find it really odd as well, I mean 1 in 15 after all! I actually think I will make my own - copy the design of the certificates I already have from Irrational (minus any sigs since they would only be copies and not originals) and then edit in the item and number, etc. At least it will then match as well. Oh, so excited!