A dictionary of Confusable Phrases: More Than 10,000 Idioms and Collocations

out of one’s box • out of the box
out of one’s box —(sl.) crazy or very drunk (also: off one’s box):
If you think this book is good you must be out of your box.
out of the box —(Austral. coll.) 
1
. said of smth. that can be
put to immediate use: The industry has yet to sell a computer
which can be used by a novice, straight out of the box. 2. very
special or exceptional: You mustn’t run away with the notion
that I’m anything out of the box in back-country conditions.
Note: 
a) The expression does not correlate in meaning with
the phrase outside the box—(in the phrase “think outside the
box”) think in an original way (showing imagination, unusual
approach, etc.): His marketing strategies are looking tired. We
need someone who can think outside the box a little more.
b) The expression does not correlate in meaning with the phrase
knocked out of the box
— used of smth. ousted or replaced by
smth. else: IBM was almost knocked out of the box by other
types of computer software and manufacturing.
See also: first time out of the box / just out of a bandbox.
out of one’s head • out of one’s own head
out of one’s head —
1
. (also: off one’s head) crazy or behaving
as if mad: She was hysterical — Mike himself said she was out
of her head! 2. very drunk or intoxicated: By this time we
were all tipsy but Peanut was out of his head. 3. unconscious;
delirious: In the morning when Andrew Masters came to see
how he felt, Pledger was half out of his head. 4. from one’s
imagination or memory: I didn’t get the story from any book
or magazine; I made it up out of my head.
out of one’s own head — = out of one’s head 4: Were not all
these answers given out of his own head?