No. They were copy/pasted.
Even embedded graphics will show up in the links panel.
You’ll need to get the originals if you’re going to print the document.
Could they be embedded opposed to linked?
Yes, but you should still see them in the links panel - with an added graphic. Without seeing a screenshot of your links panel when you select the image, it's hard to give an accurate answer.
I wanted to convert them to CMYK.
You can do this via PDF export.
EDIT:// After seeing Bob's post, after copy/paste they do not show in the Links panel. Good to see I am still learning.
Thanks Bob. Always helpful and fast!