Post the latest Storms, Hurricanes, King Tides and other events (wild weather warnings too), they may help shift the beaches for the Detectorists.
[posting before and after pictures of sand washouts is more than welcome]
Could also be handy for fresh water gold finding folks.
We recently had a Supermoon early in December.
This causes both higher and lower tides aka King Tides, peak 1–2 days afterwards.
This may have shifted some sand from your secret beach spot(s), especially if it was in conjunction with rain/storm.
There was another Supermoon on 2-1-2018:
West Coast – 4 January 2018
On the West Coast the King Tide is predicted to peak on Thursday 4 January 2018 at around 12:05PM.
East Coast – 5 January 2018
On the East Coast the King Tide is predicted to peak on Friday 5 January 2018 at around 10:43AM.
Next Supermoon January 31 2018.
This can also be a good chance to get further into the mud at the super low tide
You might need to get in some extra Zzzz if this occurs during the night.