I'm going to pick up $10 I found on campus
Do you think it is wrong to pick up that money?
Yes, that would be considered stealing by the constitution.
It's hard to find out who dropped that money. You are better off keeping it since it is not that much money anyway. If you feel guilty then you should donate it.
You are right, why not keep the money then donate it to the school and I'll get a tax deduction.
I am glad that you found a solution that will make you feel less guilty. If you hadn't pick up the money somebody else would have.