Lightroom :: Won't Export All Files And Doesn't Notify Which Ones It Didn't

I have a large library and one day i wanted to make sure that none of the files were corupt so I thought of an idea to export my entire library to see if i get a notification if any of my files didn't export. I could then check on those files to see whats wrong. But trying to export that many images caused lightroom to crash so I exported by year instead. Some years were fine, but others like 2011 for example, out of 13906 images, only 9824 exported. I would be ok with that if lightroom notified me which images didn't export. Normaly, when i try to export images that are ofline, lightroom will tell me which ones didn't export and say that they can't be found. How am i supposed to find those 4000 images that didn't export if i don't know what there file names are? I tried exporting the previews as a catalog and all 13906 exported fine. I updated my dng previews and I even genereated new standard sized previews as well. I also ckecked for missing images under Library/Find Missing Photos, and there were none missing.