Only the QMC will show which objects are created by whom. To see with which specific users it has been shared you likely need the powertools or equivalent development to retrieve additional info from the .Shared file, note that shared objects are not stored into the original QVW file.
The permissions you mention are to allow users to create shared objects using the Ajax interface, but not to see who created them or how they are shared.
In addition to the previous remarks, objects that are created (& shared) by some users in the AccessPoint will not automatically appear in other users copies of the same document. They have to be imported by the users that want to make use of them. Server objects can be imported from the "Repository".
In the AccessPoint and after opening a particular document, click the Repository icon (10th icon from the left, looks like a miniature bar chart) to see which server objects are available to you in this document and who created them (tooltip contains lots of information).