Say what you will about the troubled U.S. Postal Service: It’s still the best way to get a priceless notebook to an adventuring archaeologist and out of the hands of the Nazis. That’s what the University of Chicago discovered last week when it received a mysterious manila envelope with what appeared to be Egyptian stamps addressed to one Henry Walton Jones Jr. The only problem: there is no Henry Walton Jones Jr. on the faculty of U of Chicago. Staffers at Rosenwald Hall, where the package was delivered, shrugged and tossed it to a student to figure out where to…