you most likely check the "do not show this message again" for the missing references message. it can be turned back on in sytem settings -> advanced.
You can also change the reference of renamed drawing to be linked to new renamed part. To set this, in the Open Dialog Box, click once on the drawing (don't open it) and click on References. Now double click on the part name (ctrl + click or click pause and double click) and browse to the renamed part you want to reference this drawing to.
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Go to the Feature Manager Tree and select "show" for each sheet that has these hidden view place holders.
I had to do a bunch of these recently when checking "missing" files into PDMW. Was easily resolved once I discovered how.
Mybe it doesnt apply to your siutation but worth trying.
Alternatively, if the file itself is actually missing. Use SW explorer to re-assign them. You will only need to do this once for each drawing file affected.