Lost collection of rare vintage postcards from the 1940s in a yellow envelope last seen at a local café near East Anglia.

I lost a collection of rare vintage postcards from the 1940s while exploring the countryside near East Anglia. They are in a yellow envelope with a few noticeable stamps on them, and I last remember having them at a local café. These postcards hold a lot of sentimental value to me as they belonged to my grandmother, and I'm desperate to get them back. Please let me know if you've seen them!