How am I supposed to remember which date I purchased these bitcoins which were transferred from another wallet to the cryptsy account..
You have to train your memory..

or..
- Keep seperated wallets to trade on different exchanges. (Unique BTC address for every exchange)
- Take and save screenshots of your deposit wallets from every exchange.
Otherwise, little chance of finding this transaction.
In other words, I'm fucked? All I got is an email from cryptsy replying that they were working on my bitcoin transactions.