If "audit" option is on check "event viewer" (control panel\admin tools).
If you have server check "event viewer" there too.
Assuming that you are talking about WinXP Pro, Win 2k Server or Win2k3 server.
List of recently used docs doesn't mean that user actually sent doc to print.
There are several options/solutions for such things... i hope it is not too late...
Taken from windows help file:
Audit object access
Computer Configuration\Windows Settings\Security Settings\Local Policies\Audit Policy
Description
Determines whether to audit the event of a user accessing an object—for example, a file, folder, registry key, printer, and so forth—that has its own system access control list (SACL) specified.
If you define this policy setting, you can specify whether to audit successes, audit failures, or not audit the event type at all. Success audits generate an audit entry when a user successfully accesses an object that has a SACL specified. Failure audits generate an audit entry when a user unsuccessfully attempts to access an object that has a SACL specified. To set this value to no auditing, in the Properties dialog box for this policy setting, select the Define these policy settings check box and clear the Success and Failure check boxes.
Note that you can set a SACL on a file system object using the Security tab in that object's Properties dialog box.