HI jyeh74,
Thank you for posting your question in our forum!
The first approach I would take is to assess the timeline of when shares were acquired each month or annually and document on a spreadsheet in chronological order from inception to sale date.
If the monthly amount of shares purchased is not known, but the annual amount is, I would then break up that known amount into equal monthly increments and then apply the Euro price from the last day of each month using a website similar to Oanda.com (https://www1.oanda.com/currency/converter/) and let your spreadsheet do its magic by mathematically computing the Euro-to-USD value for each month of shares purchased and add up the total.
This will be more than sufficient to reasonably justify a rational basis to document a cost basis you can substantiate upon any unknown audit.
I hope this is helpful to you jyeh74!
Regards,
Alan S.
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