[PeterT]

I just tried an experiment:

START

Spoiler:

dir *whiskers* /s 
Volume in drive K is KOBOeReader
 Volume Serial Number is 52F9-BD87

 Directory of K:\.kobo-images\210\200

06/03/2014  10:38            30,710 file____mnt_onboard_Braun,_Lilian_Jackson_Jim_Qwilleran_Feline_Whodunnit_-_29_-_Cat_Who_Had_60_Whiskers,_The_epub - AndroidBookLoadTablet_Aspect.parsed
06/03/2014  10:38            40,290 file____mnt_onboard_Braun,_Lilian_Jackson_Jim_Qwilleran_Feline_Whodunnit_-_29_-_Cat_Who_Had_60_Whiskers,_The_epub - N3_FULL.parsed
06/03/2014  10:38             9,429 file____mnt_onboard_Braun,_Lilian_Jackson_Jim_Qwilleran_Feline_Whodunnit_-_29_-_Cat_Who_Had_60_Whiskers,_The_epub - N3_LIBRARY_GRID.parsed
06/03/2014  10:38            30,710 file____mnt_onboard_Braun,_Lilian_Jackson_Jim_Qwilleran_Feline_Whodunnit_-_29_-_Cat_Who_Had_60_Whiskers,_The_epub - N3_LIBRARY_FULL.parsed
               4 File(s)        111,139 bytes

 Directory of K:\Braun, Lilian Jackson

06/03/2014  10:38           145,759 Jim Qwilleran Feline Whodunnit - 29 - Cat Who Had 60 Whiskers, The.epub
               1 File(s)        145,759 bytes

     Total Files Listed:
               5 File(s)        256,898 bytes
               0 Dir(s)     262,545,408 bytes free

Removed ePub via menu from GLO
Reattached GLO to PC with Calibre shutdown

Spoiler:

K:\>dir *whisker* /s
 Volume in drive K is KOBOeReader
 Volume Serial Number is 52F9-BD87
File Not Found

So with current f/w on a GLO all parsed files associated with an ePub stored on internal storage were removed.