If you are unsure if you have more superannuation accounts about the place than you can recall, or you have moved house and don't get any mail from that old fund anymore - then you might want to have a search to locate that missing superannuation. Once located, explore with us your options for amalgmating your monies to an appropriate fund. See this link to start the search.
http://www.ato.gov.au/individuals/content.asp?doc=/content/16442.htm