The ensuing raid lasted two days. In the process, they burned some of the homes, the mission, and drank the padres' sacramental wine. They set sail on Dec. 20th, never to darken Orange County's shores again.
As it turns out, the pirates didn't get away with all of the valuables of the Mission and the townspeople. Luckily, word of Bouchard's approach made its way down the coast about two days sooner than the pirate himself, and the locals took the opportunity to take their valuables out into the hills and bury them for safekeeping.
Undoubtedly, these treasures were dug up again after the coast was (literally) clear -- especially any of the valuable alter pieces from the Mission.
Unfortunately, many early Orange County adobes have been dug up and destroyed by dim-witted treasure hunters over the years. Every one of the sites they dug up was, as you'd expect, completely treasure-free.
However, we know of one documented site where treasure was hidden that has not been dug up. It's now about eight feet under the VIP reserved parking spots at San Juan Capistrano's City Hall.
Gentlemen,... Start your shovels.