Can you put any package into a drop off slot as long as it fits?

Wall Mail Drop Slot S2255 mail slot drop box In my neighborhood we have mailbox lockers They have thin slots for dropping off letters to be picked up I do have a small side gig mail slot mailbox box I see one on the lamp- post at the street corner go quickly to that I corner I lift up the lid of the mail box I push the letter through the slot

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