From the IRS's point of view, it is your responsibility to maintain record of stock history.
- If you don't know the basis, the entire proceeds will be taxed.
- If you don't know the shot / long term status it will be taxed as short term.
- This is the worst of both worlds.
Unless you transferred the stock between brokers, I would expect that this is going to be long term.
Brokers have been required to track basis on stock purchases since 2008.
As far as the basis goes, you must determine an approximate time period. Then track the stock history online.
Thes site may provide guidance:
Cost Basis Basics
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