The cache is not at the published co-ords. You will need to complete the A Leisurely Stroll Through Wareham Adventure Lab Cache.
https://labs.geocaching.com/goto/wareham
As you complete the Adventure Lab Cache keep a note of the numbers for A, B, C, D & E
This bonus cache can be found at: N50 41.A D C W002 06.(D-B)(C-A)E
Hope you enjoyed the Adventure.
The path can be muddy after rain so boots may be needed.
Congratulations to Malcolmthe1st for being FTF.