These are very useful. Here in Ireland that service already exists as ParcelMotel.
As someone who has used ParcelMotel, I can't help but notice the differences between the things I love about the PM site that aren't on the BufferBox site. BB use uninspiring stock images but PM have commissioned an entire set of custom artwork that's a strong brand and very cutsey and describes their service using metaphors.
PM are very explicit about the pricing. It takes up a big chunk of their homepage. After several minutes I still can't find how much bufferbox costs!
And do BB only email out the PIN? Surely sending it to everyone by SMS would be a better idea?
The product is a great idea and it's implemented so well through different companies here in Europe. It's good to see something similar starting off over there also.