Stray lines in cannot be found, selected, or deleted

[nmycps]

In my attached image, viewing from outline mode, you can see my 10 artboards with round objects in nine of them, and then there are these very large stray lines and squares going everywhere. I've been copying/pasting from another .ai file into this one. And only when in outline mode can I see them. Some are just wild-looking, while others appear to have been guides. Searching for stray points from 'Select/Object/Stray Points' doesn't find them either. Maybe something from my other file got copied over.
There are clipping masks in my artwork but it would seem you can still search for odd lines within clipping masks in the Layers panel, right? Don't know how to get rid of these. 

I have Illustrator 29.8.1
Running MacOS Sequoia 15.5

[Kurt Gold]

Unfortunately, there is no attached image in your post.

Can you perhaps share the original Illustrator file instead?

[HARSHIKA_VERMA]

Hi nmycps

Thank you for reaching out. In addition to what our expert has requested, could you please share the details of your operating system and the version of Illustrator installed on your machine?

We will be happy to assist you further.

Thanks,

Harshika

[nmycps]

Unfortunatey I cannot share the file directly. It's business-related.

[Kurt Gold]

Now the image appeared.

The suspicious objects could be (possibly locked) guides, clipping paths, completely transparent objects or something else.

Have you already carefully inspected the Layers panel and are you sure none of the unwanted objects can be located there?

What happens if you hide or delete all guides in the View menu?

[nmycps]

To update, after being more meticulous in the Layers panel, I did find this time that there were some stray points and <Image> objects with no content, that were the problem. In my file, I had purposely placed some single points as placement references for objects. Knowing that I didn't need them now, I eliminated those using the Select-Object-Stray Points, then most of the strays dissapeared. Also, some of the unselectable vertical lines that looked likes guides (even though turning guides off and on showed them appearing and reappearing), were eliminated.
Then,  I found some <Image> objects within clipped groups that were showing up as very large squares, but had no contents. So I removed those. Now it seems to have been cleaned up. 
Though it is puzzling why all these stray lines and images were not directy selectable. This is one issue that needs improvement in Illustrator when dealing with clipped groups and the contents. Because you have to rely on the Layers panel to select certain objects directly.
Thank you for the tips Kurt!