I understand your hesitation. Please understand that the "snippy" attitude of the CM was not directed at you personally. They get inundated with these calls when someone reports that there was a pin issued.
If every call you got was someone asking "Do I have a PIN?" and no one books anything, it gets pretty tiring.
The best way to ask is be nice. Ask the agent you speak with if you have a pin code. Ask them to check the dates you're looking to travel. They will ask you all the standard booking questions, or they will check for interactions on your household. The first way is the more precise way, as checking for interactions is tricky and not easily seen if a PIN isn't provided.
Also, if you don't have a pin, but you are interested in waiting to see if a PIN will be offered later on, book your stay with a courtesy hold,(14 days without deposit), and check periodically.