Thanks guys.

That idea sounds logical ........ right up until some bloke turns up to collect his container. I mean to say, how does he know that it has been tampered with until after he has turned up to collect it? 

#1 son owns a company working with container ships arriving at Southampton docks. ALL containers need to be fumigated so how would the crims know if it had been tampered with by the fumigation company or the Police?