Suggest you try Black Widow.
The current owner may have registered on their web site. I think you need to be a BW owner to post over there. To prove you are an owner, I believe they require the bow's serial number.
If you are lucky BW may have records of the serial #. If you are really lucky, the new owner is registered on their site. And if you are touched by God, he'll be willing to sell it back to you.
Privacy would probably prevent them from giving you the name but they might be willing to send an email on your behalf.
Worth a shot.