Financial institutions were not required to track cost basis until about 2012 or so, so Vanguard never really reported cost basis of anything to the IRS until tax year 2012, but only for shares purchased after then.
And if one looks at a 1099-B and the IRS forms for reporting that info, even if the 1099-B has a cost basis, you got your Form 8949 codes A, B, C, D, E, and F that deals with all this.
And even places that kept great track of cost basis and told you what it was didn't report it to the IRS (codes B and E).
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