Ipad got stolen and then disappeared from "Find my IPhone"

You will only see it in "Find my phone" on iCloud if it is switched on and connected to the internet.

And any knowledgable thief can defeat the 'find my' app in a matter of minutes.

It's meant more to be a 'where did i set it down at' assistant than a theft recovery tool.

Report the theft to the police and change any passwords you used on that device

Apple (and no one else) can not assist (with serial number or iCloud) in finding a lost or stolen iPad.

Report to police along with serial number. Change all your passwords.

These links may be helpful.

How to Track and Report Stolen iPad

http://www.ipadastic.com/tutorials/how-to-track-and-report-stolen-ipad

Reporting a lost or stolen Apple product

http://support.apple.com/kb/ht2526

What to do if your iOS device is lost or stolen

http://support.apple.com/kb/HT5668

iCloud: Locate your device on a map

http://support.apple.com/kb/PH2698

Report Stolen iPad Tips and iPad Theft Prevention

http://www.stolen-property.com/report-stolen-ipad.php

How to recover a lost or stolen iPad

http://ipadhelp.com/ipad-help/how-to-recover-a-lost-or-stolen-ipad/

How to Find a Stolen iPad

http://www.ehow.com/how_7586429_stolen-ipad.html

What NOT to do if your iPhone or iPad is lost or stolen

http://www.tomahaiku.com/what-not-to-do-if-your-iphone-or-ipad-lost-or-stolen/

Apple Product Lost or Stolen

http://sites.google.com/site/appleclubfhs/support/advice-and-articles/lost-or-st olen

Oops! iForgot My New iPad On the Plane; Now What?

http://online.wsj.com/article/SB10001424052702303459004577362194012634000.html

If you don't know your lost/stolen iPad's serial number, use the instructions below. The S/N is also on the iPad's box.

How to Find Your iPad Serial Number

http://www.ipadastic.com/tutorials/how-to-find-your-ipad-serial-number

iOS: How to find the serial number, IMEI, MEID, CDN, and ICCID number

http://support.apple.com/kb/HT4061

 Cheers, Tom 😉