The brown cardboard box used by Fractal Design is instantly familiar as it is pretty much identical to the packaging used for every other case on the market. The details on the box are specific to the Core 3300 and the exploded diagrams show the internal layout of the case.
In particular the diagram shows the vertical hard drive bracket that sets the Core 1300, 2300 and 3300 apart from most other cases on the market.
Fractal Design has done a fine job with the user guide for Core 3300. One side of the fold-out sheet shows possible locations for case fans or radiators, as well as guidance for the removable filter on the bottom of the case. The other side of the sheet helps your PC build, however this isn't as useful as it might be.
Although the information and drawings relate to the Core 3300 it would help if some of the dimensions from the product sheet were added as notes. For instance, the power supply is restricted to 170mm length if you use a bottom 140mm case fan and the CPU cooler can be as tall as 185mm.
In the accessory box you will find neat bags of screws and fasteners however they are not labelled so you need to cross reference them with the description in the user guide if you want to be certain which type of screw is which.