Answer:
Step-by-step explanation:
Depends.
If it has never happened before, I'd make the return, depending on what it was. If it was a screwdriver set that looked unused, I do it on my own authority.
If it was something intimate, I'd be hesitant. I'd call a supervisor. I wouldn't do this on my own. (least likely).
If there was a policy, I'd ask what the policy said. A supervisor should know the answer to that. (most likely what I would do).
If there were a lot of returns that day, I think I'd be hesitant. I'd call for help.