Are the frames locked on the page? (Object > Unlock All)
Did the version update from 2015 to 2017? What happens if you save the file to convert it to the current version?
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This is one of those try the usual suspects. In this case try saving one of the files as an IDML file and re-opening.
Then see if relink is available.
Also, as a desperate measure, you could select each placed image and then choose File > Place and navigate to the original icon file. If THAT doesn't work you've got a heavy-duty problem. And we'll take it from there.
Thanks for your reply but I figured it out! My text boxes were linked as .icml files and once I unlinked those, the images embedded within those text boxes were re-linkable. Hooray! Only took two days to discover this, but thankfully I did!
Great news! And thank you for coming back to let us know what was going on.