Had you activated the find iPhone (iPad) feature on the ipad ? If yes, you will be able to trace it's present whereabouts if it's in use & in a wifi area. Also logon to itunes, with the same apple account, pwd. etc. & take their help to trace it. However you need a local police report too, I believe. If nothing works then too you may be able to factory reset it so that personal photos, data may not fall in the wrong hands.