Each card was presented with ‘ The Red Letter’ a romantic magazine published by D.C. Thomson. It is unusual to find a collection from one person to another ( usually only single cards turn up) . Presumably Walt saved them all carefully and brought them back with him when he returned from the war. All are preserved in nice clean condition with only minor signs of handling. The small size means that they could not be used postally ( or possibly Min wanted them to remain private) so they would have been sent to Walt in envelopes.