Wait two weeks an feed at night. With BP's that don't eat it's a waiting game. Hunger wins but it can take a long time.

Grey inside? You cut it open an it was grey as in no blood? Are the mice mussy? With red meat if it's grey it's blood less an freezer burnt. With prey I've only seen that with old refrozen prey. Shops freezer had failed an they just refroze everything an sold it like nothing happened, That's why I raise my own.

Tons of "tricks" to make prey tasty to snakes. Thaw in the snake room or on top of the cage. Hit the hair dryer of a bit then offer to the snake. Zombie mouse dance. You don't just hold it by the tail. Move the mouse across the snakes view. Braining prey. Drop feeding, just drop the prey in the cage an if it's still there in the morning, toss it out. Smaller prey, it works an that's what matters. Others will add more like scenting prey an 100 others things.


Good luck!