It is definitely puzzling how the barricade is wrapped around the mailbox so badly but the seating at the restaurant hardly looks touched. As matt1234 mentioned they are looking pretty hard at the tree well and that may have directed the blast in a certain direction. Looking for video to confirm.
The barricades were moved like crazy by people assisting victims.. Be far more concerned about the shadow cast by the package compared to the mailbox. FAIL.
I am not sure whether the barricade on the mailbox is bent or just turned/tipped. From a quick glance, the barricade appears about 45 degees from the curb line and partially tipped, which might make it appear bent (or more severely bent than it really is).