Kammala wannan jumla: Mayer ta aro na'urar rubutu daga otal din, kuma ta buga rahoton Oslo mai shafuka bakwai a cikin haruffa biyu a cikin kwanaki biyu. Ya aika da farko a ranar 1 ga Nuwamba, yana roƙon mai ba da shawara na soja na Burtaniya ya shirya wa BBC World Service don canza gabatarwar shirinsa na Jamusanci idan yana son karɓar Rahoton. An yi wannan, kuma ya aika da Rahoton tare da bututu mai ɓoyewa daga samfurin samfurin kusa. Ya kuma rubuta wasika ga abokinsa na dogon lokaci na Burtaniya Henry Cobden Turner, yana roƙonsa ya yi magana da shi ta hanyar abokin aikinsu na Danish Niels Holmblad. An bukaci wannan hanyar sadarwa ta kai tsaye tun lokacin da Biritaniya da Jamus suke yaƙi, amma Denmark a lokacin ba ta da hannu a yaƙin. Mayer ya ci gaba da tafiya zuwa Denmark don ziyarci Holmblad, yana tambayar ko zai iya ba da bayani tsakanin kansa da Turner. Holmblad yarda da yardar rai, amma da zarar Hitler
Ya mamaye Denmark a ranar 9 ga Afrilu, 1940, wannan hanyar sadarwa ba ta da amfani. Daga nan Mayer ya koma Jamus. Kodayake Gestapo ta kama Mayer saboda laifin siyasa a 1943 kuma an tsare shi a Dachau da sansanonin Nazi har sai yakin ya ƙare, 'yan Nazi ba su taɓa sanin Rahoton Oslo ba.