Wells Fargo Lock ... Newbie

Hi there!
I am a newbie to this forum. I don't know anything about locks as of yet. I was wondering if someone could help me identify what this lock was used for. I have a Wells Fargo Lock. It's quite big and heavy. Has 2 keys. Has a Shield on the back that reads "Property of Wells Fargo & Co Express San Francisco Division." The lock is stamped with the same numbers that are on the 2 keys. Oh and the lock works too. Oictures are attached.
Any kind of help would be great! :D
Thanks
Julie