Logic Riddle

Problem:

Solution:

If it is in box 1, then message 1 is false, message 2 is true, message 3 is false. [Good!]
If it is in box 2, then message 1 is true, message 2 is false, message 3 is true. [Bad!]
If it is in box 3, then message 1 is true, message 2 is true, message 3 is false. [Bad!]

So it is in box1!