Incorrect cost basis on E*Trade. How to fix?

My accounts date back to the late 90’s and I was looking at the account today and some of the gains seem unrealistic, like mutual funds with gains of 6000% (VHT) or AMGN showing 3000% since at best 2002. E*trade shows AMGNs cost basis as 9.29/share where I see the price to be ~$50 in mid 2002.

Any idea why the cost basis are so wrong and how would I fix without having statements back to that timeframe?