箱封 meaning in Chinese

seal metal strior lead fastener used for locking freight car

Etc , were also researched for relevant information on the 40s hong kong cinema . a great majority of the films produced in the 40s are lost
非常高兴得到南华早报的协助，让我们到厂房去翻阅原来一箱箱封好的华侨日报及华侨晚报。
Indicating container number , seal number as well as name , tel no . and address of the shipping agent at final destination , must specify the name of loading port and discharging port
我觉得除目的港资料强调外其他略显多余吧， b / l都会显示装卸港和箱封号，这个不必多虑吧？有相关显示即可吧？