There came a point when the Venture City stopped pretending to have a government. Why bother with the expense and the trappings? The idea that corporations were things that a government managed through regulation was a quaint notion -- one whose time was passed, and with its abandonment went quaint ideas like laws, courts, and regulation. The idea of any kind of state was made wrong and foreign, with governmental or (To be replaced by a mosaic of contracts, arbiters, and policies)
Eventually, the Capitol died out as a curiosity to city residents and the buildings were abandoned. What happened to those original documents and history is unknown. Much of it was destroyed as the areas around the Capitol fell into dispute between rival gangs, until the last vestiges of its perceived authority disintegrated.
The Capitol was abandoned decades ago, sold to a small company that intended to use it as storage space for records. Since then, it was used as a Corporate Outreach center, a weapons testing ground, a gang headquarters, an out of city brothel, and is many times included as part of the Dumps. It is a popular place for hero/villain "showdowns" which involve lots of collateral damage. There are enough stable buildings, however, that its considered Wild Side, and at any given time there are a few store gang members hanging out.