When purchasing Direct Buys or trying to view ads, it can be sometimes difficult to find the actual pages the ads appear on. Publishers often rotate ads, geo-target them, or place them on sub-pages instead of the main index page.
To make this simpler, JuicyAds provides a listing of Sample URLs for each adzone.
You can view these from the Website Profile pages available through the Marketplace, and linked from the Manage My Ads page, and Campaign Management page.
Click the Sample URLs and you should be able to easily find your Direct Buy ads on those pages.