Library staff members cannot access to your full past circulation history, unfortunately.
To check what you have checked out, log into your library account from the library homepage using the link in the lower right hand corner of the Discovery catalog search (off the library homepage):
You can see the various tabs. "Checkouts" is for current circulation. "Requests" are for interlibrary loan requests status and history:
Your account might not have your full history, but it will show what was recently requested and checked out. It will give more information than library staff can see.