You need to report the date acquired since there is a different tax treatment for investments held for more than a year and those held for less than a year. So, just pick a date that is more than a year from the date you sold the items for which you don't know the date acquired.
For gifts, your cost is normally the cost it was for the person who gave it to you. But if you don't know that, you should enter -0- to be safe!
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