This site claims [all] 20 cannon were recovered.
On this same day, 35 years ago, the legendary deep-sea explorer Mel Fisher discovered the shipwreck...
www.maritime-executive.com
There have also been smaller swivel guns/versos recovered, but varying accounts of how many (4 to 8).
I doubt they have all of the everything from the
Santa Margarita. It broke up in the surf and so far only a 23 foot long hull section has been located and recorded since 1980. It's spread over a much wider area and the general whereabouts known and bits salvaged since the 1620's. How much was already found or remains to be found hasn't been tallied up that I can find in a quick looksee.