Corrupt AI Files, need suggestions

Hello, 

So we had a catastrophic failure on a file server that resutled in a lot of files being recovered. While we have some files that we know are lost, we are running into a reoccuring problem with illustrator files matching the file size of a previous backup but being 'corrupt'. This leads me to suspect that if there is corruption on these files, it's not by much. 

Is there any ways in which the community has found to deal with this issue? Obviously data recovery is tricky and there may still very well be data lost. But the disproportionately large amount of corrupt illustrator files leads me to believe there's something I'm missing. I've tried just importing these files with no success.