[Plugin: W3 Total Cache] Purge all objects from CDN via wildcards?

Most of my images are not showing on amazon. It seems to be uploading the standard sizes of 150×150, 300×300 and original image size, but I have files that are for example 250×180 that were not uploaded.

If I get the path to one of those files wp-content/uploads/2012/08/filename-250×180.jpg and go purge it with the purge button at the top of the page, it works fine, but if I click upload all attachments, it doesn’t. I’d like to use a wildcard in the purge box, like this wp-content/uploads/2012/08/*

That way I can clear that entire section out. Is there an easy way to purge every image and have it take all of them again?

http://wordpress.org/extend/plugins/w3-total-cache/