It's unlikely that anyone will be able to help you locate your lost bitcoin purchase from 2009, as there were very few people involved in the bitcoin community at that time and most of the forums and websites from that era are no longer in operation. However, you may want to try searching through archived versions of old bitcoin forums and websites, as they may contain records of your transaction or other clues that could help you narrow down your search. Some popular forums from that time period include Bitcointalk.org and the Bitcoin Forum, but there were also many smaller and more niche forums that catered to specific communities or interests.

Additionally, you could try reaching out to any contacts you may have made in the bitcoin community at that time, as they may have some knowledge or information that could help you in your search. Social media platforms like Twitter, LinkedIn, and Facebook could be useful for finding and reconnecting with old acquaintances and contacts.

It's also worth noting that if you didn't properly store or backup the private keys associated with your bitcoin purchase, there may not be any way to recover the funds even if you do manage to track down the transaction. Bitcoin transactions are irreversible, and if you don't have the private keys needed to access the funds, they will be lost forever. So it's important to take proper precautions when storing and securing your cryptocurrency holdings to avoid losing them in the future