XF 1.4 How to locate a specific attachment image?

On Google PageSpeed Insights I am getting warnings that some of the images on my site are uncompressed (or only slightly compressed). I would like to be able to find these images and use a higher level of compression on them. Unfortunately, I cannot find an easy way to locate them. Here is an example of the type of message I get from Google:

Compressing and resizing http://bonsainut.com/index.php?media/spider-pot.1258/full could save 574.1KiB (99% reduction).
All attachment files in XenForo use some sort of code for the names and the file names are not simple alphanumeric. Sometimes I think there must be a really simple way to do something and I am just not clever enough to figure it out :)
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