Items in the inbox are sorted by move-date, with the closest dates appearing at the top of the page. You can also filter the results to show a specific property by using the drop-down menu at the top of the page.
Click the drop down to show all the properties you manage. Then click on the property you want to manage. The inbox will update to show only residents from the selected property.
To remove the filter and see all properties again, just click the x in the filter menu.