Sara Van Cotthem takes a safety knife and precisely slices open the side of a cardboard box to unpack its contents, an aluminium stepladder made in China. Working under harsh fluorescent lights at the border inspection post at the port of Antwerp, Van Cotthem checks the paperwork and taps the ladder with a magnet to check if it really is aluminium and not another metal.It is an everyday operation for customs officers at Antwerp, one of Europe’s main commercial gateways, which handled the equivalent of 13.6m 20ft-long (6 metres) containers last year. Everything is in order and the lorry, jam-packed…