The balance check for the Incentivized Testnet was available in version 1.2.0-STN1 of Daedalus for the Shelley Testnet. This allowed us to verify and confirm that the reward amounts were correctly displayed before moving them to mainnet. You will be able to claim your ITN rewards soon when we move to Shelley mainnet.
Daedalus Shelley Testnet 1.3.0-STN2 will not show that reward amount when ITN rewards wallets are restored (it will show 0); you will also not be able to restore your mainnet wallet at this stage.
In order to explore and test the Shelley functionalities with Daedalus Shelley Testnet 1.3.0-STN2 please use test ADA from the faucet. Please note that any rewards earned on the STN are not redeemable but intended for testing purposes only. For more information on how to do that please watch our video here.
As usual in case of issues or questions please do not hesitate to submit a support request - IOHK's Technical Support Team will be happy to assist you.