How to reset my macbook back to factory settings with no install disk

So I purchased a 2009 White 2.26GHZ macbook on ebay.  It came with just the macbook and charger, no disc.  And when I opened it to start it up, it was the "new user" screen asking for my Apple ID, create admin ID, wifi network setup, and such.  When I logged on it was the new Mountain Lion OS.  (The previous had stated that he had upgraded)  My question is, since I bought this used, I would like to wipe the hard drive before I really start using it because who knows what the person before me has done to it, (keylogger, tracker, etc) but how can I bring back Mountain Lion if I don't have any installation disc?  And what about the fact that this computer probably originally came with Leppord since it was from 2009? If I restart will I have Leppord or Mountain Lion?  Also, how the heck did the seller get to that "new user" setup screen for me when I turned it on??? The fact that I was like this leads me to believe that I must be able to do this... Wipe my 2009 macbook hard drive, and turn it on to a brand new Mountain Lion OS.  I am brand new to macs, and am looking forward to using this but I just want to make sure that I'm starting fresh!

Legally the Mountain Lion installation is actually tied to the person who purchased it and put it on the MacBook. He/she should have removed it before sale as well as provided you with the original disks.
Your best bet now, if you cannot get the original disk from your seller, is to contact Apple using www.apple.com/support/contact if you are in a country that supports it or call the appropriate phone number on this page, they can send your the original disks that came with the computer for a minimal fee.
If you want to bring the computer's OS up to Mountain Lion, you can then purchase Snow Leopard from Apple online and install it, then go to the Mac app store and get Mountain Lion there.
Best of luck.

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