I know there are a large number of them. I am one of the sad souls who did not take it seriously and lost my whole wallet after I invested $1,800 into 100 of them a long time a go. It happens and good luck to whom ever finds them.
Bad luck for you, same happens with many users losing their bitcoin wallets. I don't think someone other than the original authority could get the wallet for his goodness. Because every address is unique. Also I believe the lost coins won't affect the bitcoin economy, as they're already calculated on mining.