Final answer:
The question about what Dunder Mifflin sold before the paper is based on a misunderstanding as there is no information within 'The Office' show to address this. The provided passage is unrelated to Dunder Mifflin.
Step-by-step explanation:
The student appears to be asking about the product history of Dunder Mifflin, a fictional company from the television show 'The Office.' However, there is no context within the show that explicitly states what Dunder Mifflin sold before they sold the paper.
Accordingly, the question seems to be based on a misunderstanding or mix-up with another subject matter from a different context. In the passage provided, McTeague is involved in an exchange that seems unrelated to the fictional company Dunder Mifflin or its product line. Rather, McTeague seems to be engaged in an interaction concerning tickets (pasteboard slips) and is verifying details about an event for Monday night.