Contact a Certified Financial Planner™ in your area and they will help you figure out the status of any accounts to which you are legally entitled. One of the options on Bright Scope is to enter in "no account minimum" as a search criteria and that way you will find someone willing to help you even if you do not know the total value of your account.
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Perhaps this article is helpful. http://www.brightscope.com/financial-planning/advice/article/24529/10-Ways-To-Find-An-Old-401K-Plan/