flower pen and moral ambiguity

So I may be a horrible person, just so you know. I was walking back on campus walk from art class today when I saw in the distant future, one of the blind students on campus drop something. She was walking in the opposite direction of me and by the time I got to the spot where she had dropped whatever she had dropped (which turned out to be one of those pens with a flower attached to the end) she had already disappeared into Trinkle. Now, for a few seconds I contemplated not picking the pen up and keeping on walking, but then I was like "Kelly, that's horrible. She's blind, or practically blind, what will she do without her pen?" So, I pick it up and run back into Trinkle. I check the study rooms, the first floor classrooms, and the basement. I didn't check the second floor. Which I probably should have done. But, I couldn't find her, so I didn't know what else to do but to leave. But now I have her really nice flower pen and I'd feel bad using it, even though I didn't steal it or anything - I tried to find her (albeit I neglected the second floor). Hmmm. What should I do? Ignore the pen? Give it to someone else? Use it in conscious-less bliss? Realize that I'm being really stupid and silly over nothing? Yes, it's probably the latter, I know, but I'm a strange creature.