Facepack Index Query

[joe5p]

Over the years, I have accumulated 294,474 facepack images from a variety of brilliant packs. I update the folder regularly but I am conscious of the fact that due to amalgamating several master pacs and using one config file, many of the images will be of people no longer in the database. 

Does anyone know of a way of finding an up to date database index and/or any way I can run some software to compare the index to what I have. I am hoping to get rid of the faces of those no longer in the game because storage requirements are getting out of hand but don't really know where to start. 

Any help or advice much appreciated.