Some SAs just don't give out boxes unless you ask. So, if you really want a box, then go back to LV and ask.
I would recommend getting the strap for the Speedy 40. I have straps for my Speedy 30s (Damier & Mono) as well as for my Deauville and the straps are great to have!!! (Especially when you have to use a public restroom - yuck!!)
The Wapity is very useful!! You can put a phone (depending on the size), lip balm, money, credit cards, etc. and use the Wapity at lunch when you don't want to carry the Speedy around town. You can also use the Wapity to hold a small digital camera. Many uses!! Go for it!!! Or perhaps look at the mini-pochette!! They are also very useful for holding small items!!
Congrats on your Speedy 40!!! (I'm thinking of buying a Speedy 35 - I like oversize bags!!!)