The box arrived quickly and in excellent condition. The box feels fairly sturdy and the two combination locks are quite strong.
I would say it provides a medium level of security for semi-important documents as a thief could always kick the box in or just steal the box. But if you want something fairly secure while transporting documents or for documents used often this box is quite good. I would not put anything of vital importance in there however.
I was however surprised when I opened the box to find it did not contain any A4 pockets. Normally in my experience these sort of items contain a small number of pockets to start with and space for you to buy more but this box does not contain any.
In summary, given its price the box is very good and does what I wanted but if you want to secure essential documentation from theft, fire, etc I would advise you look at a higher price range.