/etc/libreoffice/sofficerc is in libreoffice-common 1:4.2.3~rc3-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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HideEula=1
Logo=1
NativeProgress=false
ProgressBarColor=222,72,20
ProgressFrameColor=245,245,245
ProgressPosition=72,189
ProgressSize=409,8
ProgressTextBaseline=170
ProgressTextColor=255,255,255
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