I wrote a crossed A/C payee cheque payable to a friend and it has subsequently been lost. Do I have to stop it at the bank? Could it be cashed by anyone finding it perhaps at one of the cheque cashing shops?
Yes. There are a lot of people about who make a living by fraudulent conversion of "instruments" that do not belong to them. Chances are it will not fall into the wrong hands, but you never know. However, if your bank charges a fee that is greater than the value of the cheque.....
There are legions of people around who use all manner of scams to steal money. A cheque that has been lost could well end up among those legions and there are ways and means of using the cheque and/or the information it contains to steal.