To Climb into a Postbox

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Dec 25, 2011 12:46 verb-phrase-selection
I found this phrase in a book.
Here I quote a passage around it.

"One afternoon my neighbor's two children were playing hide-and-seek in the street just outside the post office. Janet shut her eyes and counted from one to ten. Her younger brother Tom, who was five years old, was looking for the best place to hide. Just then a postman opened the door of the postbox in front of the post office, but he did not shut the door. Tom climbed into the postbox, and pulled the door so hard that it locked with a big noise..."

I'd like to know whether the motion "to climb into the postbox" indicates is different from that of "to climb into a car".
I'd appreciate if you'd let me know your opinions!