ancient
antique
background
box
closed
closeup
day
delivery
dirty
door
front view
grunge
iron
leaf
letter
letter box
letterbox
lettercase
letterslot
mail
mail slot
mailbox
message
metal
no people
old
one object
outdoors
past
post
postage
postal
postbox
retro
rundown
rust
rusty
send
single object
slot
sunlight
traditional
vintage
wall
weathered
wooden