I thought I'd hop in and answer your follow up question. The supplemental statement includes information that one might need for tax preparation; things like information on foreign income, and in your case, the adjusted basis of your ESPP purchases.
Since you have already been in contact with the brokerage firm, I highly doubt they would have the supplemental information you need since that's what you asked them for. The cost basis for your ESPP stock would be the actual price paid per share (which is usually below the historical stock price) plus the amount received as compensation income.
Since you don't have access to either the actual price paid per share and the amount received as compensation income, you need to make your best attempt at figuring out the basis since the other option is using "0" as the cost basis, and that doesn't give us the best result.
As Cindy previously mentioned, you can go to a historical stock site to locate the value of the stock on the date it was purchased. She included a link to one resource, here is another, just type your stock symbol in the search bar to find your stock!:
Yahoo Finance Historical Stock Data
If you don't know the dates of when you purchased the stock, again, make your best attempt at figuring these out. I would be very conservative with your estimates.
I am so sorry you've had this issue, I'm sure you're frustrated with everything needed to report this sale correctly. I believe your best way forward is to find the historical stock price and then reduce it by the discounted percentage, if you can remember what it was. Nowadays, it's often a 15% discount, but the 90's were a while ago! If all else fails, you can certainly go with a "0" cost basis.
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