Unable to see the actual product.

I wanted to buy a doll's pram for my 18 month old granddaughter at Toy Kingdom on the waterfront. She's only little so I wanted to see the actual pram (not a photo) so I could judge if the size was appropriate. I'm a visual person, the measurements on the box don't accurately help me to envisage the size. The sales assistant was lovely, but when I asked her to open the box so I could see the actual pram, she said it was not allowed (seriously?????). The manager confirmed this. They are "not allowed" to open the box so the customer can see the actual product.