Hello. Can you explain what is wrong with the cable that came supplied with your camera? Is it just that you would like to use a shorter cable? If so, I think it is trial and error in using non Yi technology supplied cables - why I have no idea.
The recommendation is to always use the cable that the camera was supplied with. What is unique/special about the cable again I have no idea, and I assume they are just standard OEM cables.
Where you can buy USB cables from in Italy I have no idea as I do not live there. But even if you find one it may not work.