In NLRB v. S H Grossinger's Inc., 372 F.2d 26, 29 (2d Cir. 1967) (quoting NLRB v. United Aircraft Corp., 324 F.2d 128, 130 (2d Cir. 1963), cert. denied, 376 U.S. 951, 84 S.Ct. 969, 11 L.Ed.2d 971 (1964)), this court wrote that "[m]ailed material would be typically lost in the daily flood of printed matter which passes with little impact from mailbox to wastebasket.