However, the Attfields realised that he responded to quieter noises, such as the opening of a biscuit tin.

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"I'd put my winning ticket inside a biscuit tin and then in the safe too, so as not to take any chances, " she added.

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It was put away in a biscuit tin and forgotten about.

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The perhaps predictable result is that the bankers lived up to the low expectations of their common sense, and devised ever more clever ways to raid the biscuit tin without being seen.

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