Your boyfriends gift of love should be valued more than anything materialistic. When he takes the time to go out on search for a perfect gift and he brings it to you accept it with a smile. He went outta his way to get that for you. Most men don't take the time to call and say hello during their busy days. If you tell him that you want to change it for the Birkin it will break his heart because in his heart he went out to buy you something that he thought was going to open your eyes and put a big smile on your face. I'm sure that on his way home he was probably thinking of the reaction you would have on your face. Do not even mention that you want to change it. He will forever quietly in his heart call you ingrateful. Take it from me I learned that the hard way.