For us geeks then take a look at how smash proof mug boxes are made thanks to SubliBlanks:
https://subliblanks.com/products/100...nt=33803722502
Now it does look like a UK manufacturer (based on fire exit green sign, fire extinguishers and possible English being spoken).
I am amazed though that Coral Graph are selling EXACTLY the same 100 boxes cheaper as they offer free delivery. Coral Graph Total with VAT £29.99, Subli Blanks £31.80
http://www.coralgraph.com/sundry-mug...er-posting-box
These are the best mug boxes we find but each to their own of course.