Urgh, Dooin and Spicy, I think my Pupiranha is going to be like that too.
We got her at 8 1/2 weeks, she was really well socialised by the breeder, she has been gently exposed to all sorts of things and lots and lots of people. She loves people but strange places, things and sounds she just freezes or hides and shakes.
I did try 101 Things to do with a Box but so far all we've managed is hide under a chair from the nasty box and hide behind Mum from the nasty box. She did pluck up the courage to approach the box earlier in the week but Old Dog came past it and it made a noise and that was too scary.
Even going for a walk is problematic. Poo bins in the park are terrifying, trees are apparently scary, strange dogs that are bigger than her are worrying, dogs running in the distance are also bad. Car rides are the scariest thing ever.
I've never had a nervous dog before, the others have been pretty outgoing and confident in most situations. It is quite strange. She's a Curly Coated Retriever so is going to be quite a big dog and she shakes like a chiuaua when she's scared. 
Is there any hope for her or do I have a big baby?