cfitz, your eyes and/or monitor are better than mine.
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The picture is too small and undefined for me to draw any conclusions.
I used the review at
Pioneer DVR-A05 DVD-RW EIDE in which there is a rear view which has the white box and looks identical to the one Ian posted.
In the review it specifically states:
The back of the drive sports a power connector, an IDE connector, jumper pins (for setting the drive to master, slave, or cable select), and a standard MMC analog audio connector. Unlike most modern drives, however, the DVR-A05 lacks a digital audio output. This omission won't concern the average user who uses digital audio extraction (DAE) to rip CD audio tracks, but it rates a demerit point from audiophiles who like to connect their drive to the digital input on their sound card.
Actually I think I can make out the analog audio pins in the picture at the review site, so the purpose of the white box remains a mystery.
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