Maybe you didn't lose it .......The x7170 doesn't have a black box, it has a power cord only.
Loads on eBay: search for <x7170 power cord>
e.g. http://cgi.ebay.co.uk/AC-Power-cord-cable-for-Lexmark-X5470-X7170-X8350-X9350_W0QQitemZ330393246960QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item4cecf8dcf0
Answers & Comments
Maybe you didn't lose it .......The x7170 doesn't have a black box, it has a power cord only.
Loads on eBay: search for <x7170 power cord>
e.g.
http://cgi.ebay.co.uk/AC-Power-cord-cable-for-Lexmark-X5470-X7170-X8350-X9350_W0QQitemZ330393246960QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item4cecf8dcf0
Hope this helps