I lost pages files

Last summer I created two very important Pages files ... unfortunately during the winter I made the bitter discovery that in the iCloud Drive folder and in the Pages app these files are disappear . I'm sure I didn't accidentally delete them. Unfortunately I can't find them in any way. With the iPhone, a search is performed by name (based on how I renamed them), one of the two files appears to me, but when I try to open it in the app, it doesn’t work. Where can I get them back?