(similar but NOT identical to How can I calculate the value of donated clothing for tax purposes? )
My wife donated several boxes full of old clothing to Goodwill, and calculated the total thrift shop value as $710.00.
I entered that into TurboTax and it asked me for a cost basis. I checked online + found Form 8283 (for total donations of >$500) and sure enough, it asks for date acquired and cost basis.
What can I do to report this, when we have no idea what the total cost basis was, only that it was almost certainly more than $1500 and more than 1 year ago?