OP needs to remember from where he bought his bitcoin (a marketplace, a forum,...) and/or how he bought it. Bank transfer, Paypal or any other payment processor. But if he is sure he used a bank transfer he will need to check his bank history report for a period. By eliminating the transfer you know about will save some time.
And what about ether in 2009? any idea how this would have been purchased or the reference
You're dumb. Ethereum didn't exist in 2009. It was created in 2012 or 2013