Run the following command in geth console:
> var theDAOABI = [ { "type": "function", "outputs": [ { "type": "uint256", "name": "", "value": "5e+22" } ], "name": "minTokensToCreate", "inputs": [], "constant": true }, { "type": "function", "outputs": [ { "type": "uint256", "name": "", "value": "2.668900014413644230605979e+24" } ], "name": "totalSupply", "inputs": [], "constant": true }, { "type": "function", "outputs": [ { "type": "uint256", "name": "", "value": "1464426000" } ], "name": "closingTime", "inputs": [], "constant": true }, { "type": "function", "outputs": [], "name": "refund", "inputs": [], "constant": false }, { "type": "function", "outputs": [ { "type": "address", "name": "", "value": "0xda4a4626d3e16e094de3225a751aab7128e96526" } ], "name": "curator", "inputs": [], "constant": true }, { "type": "function", "outputs": [ { "type": "uint256", "name": "balance", "value": "0" } ], "name": "balanceOf", "inputs": [ { "type": "address", "name": "_owner" } ], "constant": true }, { "type": "function", "outputs": [ { "type": "uint256", "name": "_numberOfProposals", "value": "0" } ], "name": "numberOfProposals", "inputs": [], "constant": true }, { "type": "function", "outputs": [ { "type": "address", "name": "", "value": "0x807640a13483f8ac783c557fcdf27be11ea4ac7a" } ], "name": "extraBalance", "inputs": [], "constant": true }, { "type": "function", "outputs": [ { "type": "bool", "name": "", "value": true } ], "name": "isFueled", "inputs": [], "constant": true }, { "type": "function", "outputs": [ { "type": "bool", "name": "success" } ], "name": "createTokenProxy", "inputs": [ { "type": "address", "name": "_tokenHolder" } ], "constant": false }, { "type": "function", "outputs": [ { "type": "uint256", "name": "_voteID" } ], "name": "vote", "inputs": [ { "type": "uint256", "name": "_proposalID" }, { "type": "bool", "name": "_supportsProposal" } ], "constant": false }, { "type": "event", "name": "FuelingToDate", "inputs": [ { "type": "uint256", "name": "value", "indexed": false } ], "anonymous": false }, { "type": "event", "name": "ProposalAdded", "inputs": [ { "type": "uint256", "name": "proposalID", "indexed": true }, { "type": "address", "name": "recipient", "indexed": false }, { "type": "uint256", "name": "amount", "indexed": false }, { "type": "bool", "name": "newCurator", "indexed": false }, { "type": "string", "name": "description", "indexed": false } ], "anonymous": false }, { "type": "event", "name": "ProposalTallied", "inputs": [ { "type": "uint256", "name": "proposalID", "indexed": true }, { "type": "bool", "name": "result", "indexed": false }, { "type": "uint256", "name": "quorum", "indexed": false } ], "anonymous": false } ];
undefined
> var theDAOAddress = "0xBB9bc244D798123fDe783fCc1C72d3Bb8C189413";
undefined
> var theDAO = eth.contract(theDAOABI).at(theDAOAddress);
undefined
// The account that holds the extra balances
> theDAO.extraBalance()
"0x807640a13483f8ac783c557fcdf27be11ea4ac7a"
// Balance of the extra balance account at 17/05/2016 19:07:35 AEST
> web3.fromWei(eth.getBalance("0x807640a13483f8ac783c557fcdf27be11ea4ac7a"), "ether");
21026.433088706794416575
The DAO's balance account is at address 0x807640a13483f8ac783c557fcdf27be11ea4ac7a.
The balance of The DAO's extra balance account at 17/05/2016 19:07:35 AEST is 21026.433088706794416575 ETH.
Update 19/05/2016 - There is now a TheDAO page on etherscan.io showing the balances of the main DAO account and the extra balance account.
Following is a transaction of 10 ethers transferred to The DAO account in block 1522378. The token conversion rate was then 1.05 ETH = 100 tokens. In this case, the amount of 10 x (1 - (1.00/1.05)) = 0.47619048 ethers was internally transferred to the extraBalance account. This is the same example from DAOHub - ExtraBalance amount.
Here's a transaction of 10 ethers paid into The DAO account:
And here the excess ether of 0.47619048 over the rate 1 ETH = 100 tokens was internally transferred to the extraBalance account:
BONUS
Here are the instructions to find out the balance of The DAO's account and the total supply of tokens created (numbers as of 17/05/2016 01:58:03 AEST):
> web3.fromWei(eth.getBalance(theDAOAddress), "ether")
10705493.966322505531632523
> theDAO.totalSupply()
1.0705488347353040142013475e+25
> theDAO.totalSupply()/1e16
1070548834.7353041
Best Answer
Let me help you clarify a couple of things. The provider you are talking about MyEtherWallet.com is just a web based tool for Ethereum (ETH) handling. It creates wallets, transfer ETH from wallet to another, exchange ETH for other crypto-currencies etc. It is a site of tools. It does not hold accounts.
If you created a wallet there, that is great. But how did you fund the address? When you say you added funds, what site did you do this from? How did you add the ETH? Cash, credit, paypal, exchange it from one coin to the next?
In other words we need more info to help you. Do not post any codes or wallet info. I have a theory that you have the funds but you just do not know your holding them. If you have an address and you can look it up, then you have the funds. Well, that is if you know how to recover it.