Found testing bug 29228, so stealing a part of the test plan. Offline ciculation first needs to be activated in the system preferences. - Click "Synchronize." - Click "Download records." - Submit a card number for a patron who has multiple items checked out. I used 42. The checkout page shows 2 warnings: Patron's address is in doubt (proceeding anyway) Patron's card is lost But when checking the patron account, both are set to 'No'.
The in-built offline circulation tool has been removed by 33961. This makes this bug WONTFIX.