Recover activities from To do

Hi, yesterday I have deleted activities from my To do but now I need to recover them.

I have tried a restore following the instructions provided at this link

Creare, modificare, eliminare e ripristinare le attività - Supporto tecnico Microsoft

but the elements I have deleted are not present in the folder Deleted Mail (Posta Eliminata in italian).

I hope something can be found in the trash but I don't know how to do.

Anyone can help?

Thanks

Alex