Final answer:
The best course of action for the unsure sales associate in the given situation is to thank the customer for bringing the problem to the store's attention and check the store's internet for store policy on returns.
Step-by-step explanation:
If the sales associate is unsure how the store's return policy applies, the associate's best course of action would be to thank the customer for bringing the problem to the store's attention and then check the store's internet for store policy on returns.
This demonstrates a willingness to assist the customer and shows a proactive approach in finding a solution.
It also allows the associate to gain a better understanding of the store's return policy and provide accurate information to the customer.