Help needed to source lawgiver ribbed box detail

[judgedredd]

Hi all as most people know i am obsessed with lawgivers i want to make a nice display box for my new Lawgiver,so i want to replicate ricos box but more briefcase size and i need to source a textured plastic sheet or something similar to recreate the box the lock i can scratchbuild unless someone recognises its original source? The ribbed effect on the box looks around 2mm wide give or take.
Hope someone can help.

 

[Contec]

Looks like corrugated styrene sheet...

 

[judgedredd]

I dont seem to be able to find anything like it in UK especially in about A3 size sheets.

Looks like corrugated styrene sheet...