Here are some helpful tips when doing a bitinstant moneygram transfer/deposit:
1. Make your zipzap amounts in differing amounts by $1 or so. Any multiple transactions with the same amount will be flagged and unable to be processed.
2. Bring your ID with you. They will ask for it.
3. Speak clearly and verify all account #'s and amounts twice.
4. When paying for it make sure the cashier selects the correct account # associated with the amount you have specified with zipzap and moneygram.
5. Be patient the first time. This process at first is cumbersome but once you get all kinks out it is actually a rather awesome and fast way to get money to a bitcoin exchange.