This article contains information on how to find a symbol in ArcWeb Services after it has been uploaded.
When a symbol is uploaded, ArcWeb creates a style with the same name as the image file.
Use the Content Library to view the new style in the library. Navigate to http://www.arcwebservices.com/v2006/index.jsp site > Build tab > and then select 'Browse & Edit'. Use the filter boxes to find the style.
Styles can not be located in the Content Library using the keyword search feature.