If you have lost your Post Office collection card is lost you can find out what you need to do on this page.
Post Office Lost Delivery Card
If you have lost your Post Office delivery card you can still pick up the package you missed. You have to wait until after 12 pm at least 24 hours after the card was placed through your door. The card may have had a Post Office branch on it or a number you had to call to get the item taken to a Post Office close to your home which you can pick up your item from.
Once you have called the number you can inquire about where your parcel is and inform them that you have lost your collection card. You will be able to organise the pick up of your parcel and where you need to get it from. You will only need to bring ID which matches the name of the person the package is addressed to. They accept many different types of ID including a valid passport, a drivers licence, credit or debit card or a foreign national identity card including many more, you can find out what else you can bring as your form of ID on the Royal Mail website.