All we know for (pretty much) sure is that they do/did exist at one time.
I have a theory. It and $2.00 will get you a cup of coffee at McDonalds. Here goes: Many prominent Democrats AND Republicans have damning information in said files. I base this theorem on the fact that when the Democrats were in power, the Republicans used threat of this document to club them. And now that the Republicans are in power and could release them, the Democrats are using threats of release of the files to club them.
I lied to you. I have two theories. If these alleged documents EVER see the light of day, they will be so altered, so redacted as to be meaningless. The end of my theories.