I sold some shares of German company in my brokerage firm. The shares were dispersed from another account that my employer held. Now that I sold the shares, I am being hit with 100% of the taxes unless I fill out the cost basis. The issue is I bought discounted shares of stock every month, for a period of X years from my employer. The employer sent my brokerage firm the cost basis but they won't take it because it is in Euros and not USD. I cannot even translate it from Euro to USD because I don't know what the exchange rate was when it occurred on that exact date/time. What do I do?
