Replying to Cute girl from accounting probably wants her stuff back

Yeah by stuff I mean calculator... at least as of now. So this girl let me borrow it because I forgot mine for

the final exam, but I never had the chance to get it back to her. She's super cute and all I know is which

sorority house she lives in on campus. Any clever ideas how I can get it back to her? Mostly as an

excuse to talk to her/see her again. Thought about banging on the front door of the sorority house and

saying, "Hi uh yeah this is for lindsey" but the girls who live there would probably be like what the fuck.

Or maybe they'd invite me in who knows. What should I do?