I bought a bunch of 2009 Bitcoins the actual coin. How can i cash the coin in? I bought several 2009 Bitcoins and they came in a nice case but that is all the info I have on them.  How do I cash them in?
It seems that you have what many people would call physical bitcoins. There are several kinds, but I am not aware of any from before 2011 that actually take the shape of a coin. The probably best known type is made by Casascius. Is there any additional information you could provide? Maybe a photo?

Anyways, if this is what you have, then be aware that none of them are in any way official. They are merely someone's personal invention. To link them to bitcoin, they usually contain the private key, with some more or less effective tamper-protection (e.g. hidden behind a self-voiding seal or the like). If printed, this private key is a long string of alphanumerical characters starting with 5. With this private key you can, using a bitcoin client, take possession of the actual bitcoin(s) associated with the coin. Look out if anyone has done that before you! The coin should also display a bitcoin address, without being hidden behind a seal or the like, which you can use to check if there actually are real bitcoins associated with it using web services such as blockexplorer.com or blockchain.info. You recognize the bitcoin address by starting with 1 if given as a string of alphanumeric characters. Sometimes bitcoin addresses and private keys are additionally shown as QR codes for easy scanning by bitcoin apps for smartphones.

As Jannes pointed out in an earlier answer, do check if your coin has collector's value. Particularly if it is true that you got a physical bitcoin manufactured by someone as early as 2009, it may really be special.

For instance, this post on Bitcoin Forum list the different types of known physical criptcoins, with some info about their mintage and sales history. The Series-1 1BTC Casascius Coin is the one with seems to attract the highest collector interest, since it was the first physical criptocoin ever to be released to the world. In the Bitcoin Forum, some of those coins were reportedly sold for 8 BTC, even though they are only loaded with 1BTC.