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Mr. Box drove up to the house where Mr. Door lived carrying a box in his hand. He was smiling as he rang the doorbell. When Mr. Door opened the door, Mr. Box’s smile melted away. Mr. Box took out a gun and shot Mr. Door. Why?

 Is Mr Door the one carrying the box in his hand?

No, Mr. Box is carrying the box.

Is Mr Door alone at home!? and most important.....is Mr Box's smile melting away for something he see!?

Is Mr Door alone at home!?  - Doesn't matter

is Mr Box's smile melting away for something he see!? Yes

Is Mr. Box angry with Mr. Door?

Are Mr Box and Mr Door friends!?

Mrs. Box on Mr. Door's knob? NO

Is Mr. Box angry with Mr. Door? YES

Are Mr Box and Mr Door friends!? They were but obviously something has changed

did mr doors did something wrong?

did mr doors did something wrong? YES

Little help: He didn't do something he promised/they agreed he has to do.

owed something to mr box?

Did Mr Door promis to don't be at home!?

Mr Door didnt get whatever it was  supoosed to be ready to be put into the box brought by Mr Box?

owed something to mr box? Yes (but no money or things, he had to do something)

Did Mr Door promis to don't be at home!? No

Mr Door didnt get whatever it was  supoosed to be ready to be put into the box brought by Mr Box? Something in the box was important for this riddle