Bodies found in auto-boxes (8)

I believe the answer is:

carcases

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'bodies' is the definition.
(I know this)

'auto-boxes' is the wordplay.
'auto' becomes 'car' (synonyms).
'boxes' becomes 'cases' (I can't explain this - if you can you should believe this answer much more).
'car'+'cases'='CARCASES'

'found in' acts as a link.

Can you help me to learn more?

(Other definitions for carcases that I've seen before include "Bodies of dead beasts" , "Dead bodies of animals" .)

I've seen this clue in the Sydney Morning Herald.

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