Thanks for the response. Edge flow has been a major issue so far and this has been really challenging when I thought it would be fairly simple. The thing to bear in mind is it needs to be a thicker version as if it's made of porcelain so with rounded edges slightly. This makes things a bit more challenging.
Attached is my attempt in C4D and a small sketch of the topology. I couldn't find the exact box flattened but the one attached has the same idea. What I would like to achieve is a neater fold at the bottom of the pack. at the moment it extrudes too much like the top.
Hope this makes sense.