Valdez is quite correct regarding the true nature of our Social Security system. Benefits are paid out of current payroll withholdings (read "TAX"). The so-called surplus that we are supposed to be running and saving for future payments is an accounting fiction. By current law, all of the "surplus" must be invested in U.S. government securities. The rationale being that if the Social Security Administration invested them in private securities, you would have a government agency owning large blocks of the private sector. In practice, this means that the gov't takes the money out of the left pocket, and puts it into the right pocket, and right into the general treasury via T-bills, T-bonds, etc.
So, the only thing that would be in Owlgore's "lockbox" is a pile of IOU's issued by Uncle Sugar. IOU's which can only be redeemed by collecting taxes from you and me. Thirty years from now (or sooner, I'm not up on the latest demographic data), when the number of retirees outnumbers the number of people "contributing" to FICA, we will have to either:
A) Raise the amount of the "contribution" taken from our paychecks to pay for Social Security, or
B) Dip into the trust fund, which will require collecting on government debt, which can only be accomplished by collecting taxes to make good on the IOU's.
Either, way, taxes will go up as the demogrpahics shift, until the situation becomes intolerable and the giant pyramid scheme called Social Security collapses. Those of my generation have a snowball's chance in hell of seeing dime one from Social Insecurity.
And those bastards have the balls to use my tax money to send me a "statement" outlining my "contributions" to date and my future "benefits", like I was investing in a 401(k)!
[rant mode off]