MS67 and MS68 Morgans

MoneyLA

A question for you Morgan collectors: Im very intrigued by these high grade Morgan Dollars and my question is a "technical one"... how did these coins survive in such high grades? For example, the large number of 1881s ms67 coins?? I dont think the mint had "mint sets" back then with special handling? The way I understand it, coins were struck, dropped into bags and moved about. Then a hundred years later these coins have few if any marks? Please explain how these survived? cheers, alan mendelson