Need to global find and scale and resize frame on a linked graphic

Question

I have a whole set of files that contain multiple instances of an icon set (placed AI file). All of these are formatted to flow in the text as anchored objects with various object styles. I need to make sure that all instances of the placed AI icons are scaled to 30% and that their frames are fit to content. I have a LOT of files and each one has at least 20 of these icons. I thought the Object find and replace would help, but unfortunately it will not let you search for links, and while I can search for the object styles, there's no option to change scale and the fit content options does not have the "fit frame to content" (and doesn't work anyway from the few tests I ran using "fit content proportionally"). 
Does anyone have any ideas for how I can fix this globally in nearly 500 documents without having to manually select each icon and change the scale and apply the fit frame to content? I've done a handful of files this way, and it's VERY time consuming.

Answer 1

First make sure this works by duplicating a file and testing.
Make 1 image the size you need it
Grep search for
Find
~a
Change to
~C
if that doesn't work then try ~c (lower case) I can't remember how that works
If it does work - then you can open 2 documents and choose "All Documents" in the Search field.
If it's fine on 2 docs - then I'd say go ahead and do the rest.
I stress to please use a duplicate set of files in case things go bad.