Bring turtle meat, bay leaves, and 13 cups water to a boil in a 8-qt. soup pot.
Reduce heat to medium-low; cook, covered, until the meat is tender, 2-2½ hours.
Strain; reserve stock; finely chop meat and set aside.
Heat butter in pan over medium-high heat.
Add garlic, celery, carrots, onions, and bell peppers; cook 5-6 minutes.
Add tomato paste, Worcestershire, Crystal Hot Sauce, Black River Creole spice mix, Chef Paul Prudhomme Seafood Magic Blend, Cayenne Pepper, Paprika, salt, and pepper; cook 2 minutes.
Stir in flour; cook 3 minutes. Add reserved stock; boil. Reduce heat to medium; add turtle meat.
Simmer for 10 minutes.
Taste for seasoning and adjust if needed.
Remove from heat and add sherry and lemon juice.
When served, garnish with parsley and chopped eggs.