What goes wrong
Single wall, tape and fill are separate lines. Crash lock is a different box, with a peel-and-seal strip.
Packaging Boxes lists Single wall boxes for this line. Single wall shares an order with tape and, if the fit is loose, with fill.
The check before you reorder
The single wall range is the general cube. It is not the double wall range, and it is not a postal format by itself.
Store sizes in columns. The print on the bundle is the size. The end of the bundle is not.
Dispatch on that order
TradePro at Packaging Boxes, for trade businesses, starts at 5% off and goes up to 10% when you spend over £1,000 a month, and it adds BACS. It does not change which Single wall boxes you needed.