I own several VGMix 1 files that do not exist in VGMixArchive taken from here.
But most of the files were incomplete (without artist and source) so I searched the web.archive. After a lot of work, I found the majority, leaving only these here, until I created a help topic to discover the sources (my luck is that those that lacked, all came with the name of the artist included in the file) I discovered the majority through the help of multiple users.
@KungFuFurby06Editionhas a complete list archived of your own remixes of VGMix 2
@hogdoghas some remixes from VGMix X on his channel, but he may have up to more. I already got in touch but the same never answered me.