Subaru BRZ 2017 Owner's Manual page 322

3-5. Other interior features
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Warning reflector storage box
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Warning reflector storage box
Depending on the size and shape of the warning reflector case, it may not
be able to be stored.
WARNING
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When storing a warning reflector
Make sure that the warning reflector is stored securely.
Failure to do so may cause it jump out of position in the event of sudden
braking, etc., causing an accident.
322
The warning reflector can be
stored.