When you verify your claim and enter your Polkadot address in step 4, the screen will indicate the success or failure of the claim. 

Below is an image of a successful example. You can see the DOT balance as well as a confirmation that attestation was done. 

Don't be concerned if the allocation address shows the message "No claim for this address for Ethereum". This just means that you claimed your tokens directly on Polkadot after the network went live. As long as you can see a balance in your account, it means both your claim and attestation were successful.

You can also check your address on the Polkadot-JS UI to verify that your account has the correct number of DOTs.

And you can check your DOT balance on any Polkadot block explorer