Looking on the internet deeply has found these results:

of the attached is the most popular phrase on the web.

of attached 1539,000 results on the web	of the attached 143,300,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
A list of attached documents and their references should be included into the body of the mail. I hear you're kind of attached. Sorry, I was kind of attached to it. Request for the lifting of an operating ban or the modification of attached conditions It's not much of a tail, but I'm sort of attached to it. See introductory sentence of attached timetable. So I understand your friend Teddy is kind of attached to his parents. No vaccine against Lyme disease is currently available, so tick awareness, appropriate clothing in tick	It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

of attached

1539,000 results on the web

of the attached

143,300,000 results on the web

More popular!

A list of attached documents and their references should be included into the body of the mail.
I hear you're kind of attached.
Sorry, I was kind of attached to it.
Request for the lifting of an operating ban or the modification of attached conditions
It's not much of a tail, but I'm sort of attached to it.
See introductory sentence of attached timetable.
So I understand your friend Teddy is kind of attached to his parents.
No vaccine against Lyme disease is currently available, so tick awareness, appropriate clothing in tick

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.