What would you do if you found 280 bucks in a stack of 20's on the sidewalk? This actually happened to me on campus a couple years ago. Not knowing what to do

What would you do if you found 280 bucks in a stack of 20's on the sidewalk? This actually happened to me on campus a couple years ago. Not knowing what to do, I picked up the bills and just stood there awkwardly, holding them out, hoping the person who dropped them would come back and claim them (under the assumption that a random person wouldn't say anything to me holding 14 20's). I skipped class waiting, and then, not wanting to miss the next class pocketed the money. Was I wrong?