Calling these finished. My version of the 0.14L really useful box.
Many thanks to @etn249 and @moony for the help with the plastic shader.
I thought I’d try some different ideas for render styles. I think the tiled version with sunlight shining through came out the best. Bonus points if you can guess what is in each tub in the overcast one. The settings were much the same for each - sky texture, 3000 samples (min=256), 32 bounces. Took a little while to render these, with the tiled one obviously taking the longest (around 30mins).