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There are a number of ways to try and locate the funds.
First, most employers are required to file an annual report on company-sponsored retirement plans, called a Form 5500. You can use a free web service like FreeErisa.com or BrightScope.com, you can search for the employer’s name and find contact information for the plan’s administrator. It sounds like you may already have that but I'm not sure from the way your facts are worded so I wanted to mention this as the place to start.
Next, the National Registry of Unclaimed Retirement Benefits is a database that matches employers with past employees who have abandoned retirement account balances. This is done by searching using your Social Security Number. The database is located at https://www.unclaimedretirementbenefits.com/
Next, if the former employer "abandoned" the retirement plan the U.S. Department of Labor maintains a record of plans that have been or are in the process of being abandoned. You can find the Qualified Termination Administrator (QTA) responsible for directing the shutdown of the plan by searching the database at http://askebsa.dol.gov/AbandonedPlanSearch/
Finally, you can search at http://search.pbgc.gov/mp/mp.aspx to see if they have anuy info about the plan or its benefits.
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