Он, должно быть, перепутал ключи и

Он, должно быть, перепутал ключи и взял ключ соседа вместо своего.

Результаты (английский) 1:

He must have mixed up the keys and took the key instead of its neighbor.

Результаты (английский) 2:

He must have confused the keys and took the place of his neighbor's key.

Результаты (английский) 3:

he must have mixed up the keys and get the key from its neighbor.