Thanks for the comment.
It’s true that none of the films have all of these elements but some of the elements are present in severeal of the films. A film like ‘The Masked Thief’ has several of those elements.
What makes a giallo is debatable, and sometimes a giallo is just an Italian murder mystery. There are many films that people call gialli that also don’t have several of those elements (‘Forbidden Photos of a Lady Above Suspicion’, ‘The Pyjama Girl Case’, ‘The Short Night of Glass Dolls’, 'All the Colors of the Dark, or ‘Footprints on the Moon’).
These films are all in the grey area of what one would call a giallo (except the last four films, I only included them for completion), and I guess it’s up to giallo-fans to decide if they consider these gialli. You could call it a list of spaghetti western/murder mysteries if you prefer.
I will admit that I don’t think most of these films were inspired by the giallo wave, and severeal of them were made before gialli became really popular. I strongly suspect that at least ‘The Masked Thief’ was inspired by gialli.