Find and replace Object with text using GREP

GREP finds text, not frames. Well, it can frames but only via text. But the solution is simple: change the object style that's applied to those boxes. If no specific object style was used, now's the time to create a style and apply the style.  You can't do that in the interface, but a small script can do it for you.

First, create an object style for the blue box (if you don't have it already). The script assumes blue box, you can use something else but then you need to change the name in the script.

Here's the script:

ostyle = app.documents[0].objectStyles.item('blue box');
app.findGrepPreferences = null;
app.findGrepPreferences.findWhat = '~a';
frames = app.documents[0].findGrep();
for (i = 0; i < frames.length; i++) {
  frames[i].pageItems[0].appliedObjectStyle = ostyle;
}

P.