I had a spot similar too that in 2019.. Chesapeake Bay Beach, once was a Amusement park from the late 1800s to 1960s, hay day was 1900 to 1933 Hunted it several times before ... never found much.. always sanded in bad... until i discovered on June 29th 2019.
Took a friend there and in "close" I felt several pilings in a area there was never any, I put him in that area as I went exploring. I went deep as I could, upper chest deep.. came across a few silver coins.. and that was all I dug that day.. Thursday. ....................... Came back Friday with another friend, Ed.. put Ed into that area Mark had been the day before and I went right back to where I found the silver coins. Boom ! More silver coins and 1 gold band.
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Driving home I told Ed Im coming back to this spot the next good lowtide we have..
Late Sunday, beautiful late lowtide.. Hammered that same area but a little deeper and killed it. Six old gold rings.. and Pilings I had never felt before.. most just a few inches above the sand level.
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That July I would dig 37? Gold rings, been awhile forgot the exact number. And after 9 month total 150 plus gold rings were dug.. and lots of sinkers, every where.. and the area as far as I know, "I had never seen anyone fishing it". Many were old.. many were modern. Dug several gold rings around the pilings..
So fast forwards to March 14th 2020.. Big storm, beach faces east, storm had 45 to 50 mph SW winds.. from that day on it was like some one had came thru with a dredge and moved all the sand from the bottom ...it was down to the hardpan.. pilings were totally exposed, many 2plus feet showing. I did notice and had to be careful the bottom was much deeper and I had to tiptoe and back track to get back to where I could touch the bottom safely.. Also, when hunting this spot during the great gold dig the bottom had very little ups... and downs slopes, it was flatter. Once the storm came thru and the sand was gone, there were lows, up and downs like rolling hills and water was deeper in these areas due to the change in the bottom.
I did very well at that location for 9 months, the gold, the coins, the sinkers.. everything was gone...only iron in the low spots and it was random... I hunted it many times in hope of finding something to give me details on what had happened. 5 years later Nada from that spot. If I were to take someone there and tell them the story they would call me a liar.. luckily I did get many gold rings on video
To this day I'm still trying to figure out where all the gold and silver went.. ... and trying to figure out how it got there with sinkers, or was it always there and covered? Or did it get washed in from another area, or has it been moving around and happened to land right there for me. and then washed away again. One thing for sure its gone and all has moved.
So that leads me to think yours has moved at some point and time. Maybe check areas on that beach that it might move to, I know about every two months I will recheck mine in hope of finding a trail or trace. I even did a few random pits digs in areas NW of where it may have washed.
Also a little story, about another spot. This place had rock jetties that extended out into the water, maybe 60 feet. Hunted the place on and off over the years, in the 14 years of hunting this spot the rock jetti's have been washed away... mostly. There are still a few big boulders in place but most have been spread out and even disappear into the sands. Hard to believe these boulders as big as recliner could be moved. If the forces of nature can move them, it can move sand, gold and just about anything we would be looking for...
Good Luck!