I know there were "episodes" in the earlier 1970s, but that was before anyone in my area was wise to erosion strategy. And, let's be honest, the machines probably couldn't hack wet salt in those days.

The reason I know of earlier 1970s storms, was the following :
I talked to a surfer, who had been a college age surfer, in the early 1970s. Him and several other surfer partyers were renting a house for the summer, a few blocks away from the ocean, in Orange county . One night, as they were partying, they could HEAR the sound of crashing waves. Even though they were blocks away from the ocean. You know the type audio : A long 25 second lull, then ....... CRASH. Then another long 25 second lull..... then CRASH. And so forth. So these guys knew, from experience, that the next morning was going to be great surfing waves.
Early the next morning, this guy goes down to the beach to surf. And when he arrived, he noticed that : Instead of the usual walk out across the sand , to the water's edge, that : There was a steep drop-off vertical "cut" in the sand. That he had to climb down to reach-the-wet sand. Like a miniature cliff, as he described it. That ran as far north and south as he could see.
Then he looked down, and noticed a round disk at the base of this cut. He picked it up and saw that it was a coin. So he started looking around, and saw more. So he propped up his surf board, and instead of surfing, spent the next couple of hours picking up coins . Just by eyeballing.
He recalled that he had about $5.00 by the time he was done. And he did not recall if any were old coins or not. And while I know that $5 isn't anything now, but , back in the early 1970s, that was fun money (fill your gas tank, buy more beer, etc....) for a college age surfer hippy kid.
I asked him if he saw anyone metal detecting, and he said : "No". He didn't see any detectors.