You can recover your lost BG tokens from farming the day before prepatch by going to recover expired mail for the burning crusade classic on the website, and restore them all to your mailbox. Friendly PSA for all the PVPers out there.
Edit: Here’s step by step instructions on how to do it starting from the front page. They made this pretty ridiculous, sorry. ><
https:/ /imgur.c om/a/sjhcjWu