Try turning the account off and on and see if those emails still show : Settings > Mail, Contacts, Calendars , then tap the account on the right, slide Mail to 'off', exit settings and go back into the Mail app, and then go back to Settings and slide Mail back to 'on'
If that doesn't work then try closing the Mail app via the iPad’s multitasking bar : double-click the home button to open the taskbar and then swipe or drag the Mail app's 'screen' up and off the top of the screen to close it, and click the home button to close the taskbar.
And do a soft-reset : press and hold both the sleep and home buttons for about 10 to 15 seconds (ignore the red slider), after which the Apple logo should appear - you won't lose any content, it's the iPad equivalent of a reboot.
And when you re-open the app see if the 31/12/69 emails have disappeared.