A number of household knives along with a blade adapted to form a machete and a small lock knife were among the blades deposited at the Centenary Way bin in June.
A police spokesman said: “All these items are dangerous in the wrong hands.
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"The best place to dispose of a knife is in a knife bin. These are safe and secure places to place unwanted knives or sharp items.
"The knife bins are large and easy to spot and are in busy, well-lit areas across the county. They aim to provide a legal and safe way to surrender knives and bladed items including kitchen knives that you no longer need.
"Using the bins helps to keep unwanted knives out of circulation. We empty the bins regularly and the knives are destroyed unless there is an obvious sign that one has been used in a crime.”