Final answer:
The provided text does not contain information about someone dropping off David's business license or a character named David.
Step-by-step explanation:
The question "Who walks into the store to drop off David's business license?" seems to be related to a narrative or a work of fiction. However, the provided reference does not include any specific information about someone dropping off a business license or a character named David. It appears you might be asking about a particular scene or character from a book or story that is not mentioned in the provided text. The excerpt given describes a situation involving a character named McTeague who is interacting with a seller about some tickets. If the answer to your question is meant to be derived from a specific text, please provide the relevant information or clarify the context of your question to receive an accurate answer.