Anthony - Since you did not provide the company where you now have or used to have 401k money, it's a little difficult to answer. If you have a statement from your plan you have more information than I do right now. One solution is to allow someone like me to do a search which might reveal who the plan administrator is. This will give you a starting point as far as your employer is concerned. That's as far as I can go without knowing more.
I wrote a guide on this recently. You might find it helpful: https://www.brightscope.com/financial-planning/advice/guide/10268/Guide-To-Tracking-Down-Old-401K-Accounts/
You should call your former employer's benefits or human resources department. They should be able to provide you with the contact information.
If your employer no longer exists, then you will need to do some research. One resource is to contact the Employee Benefits Security Administration (aka EBSA) of the Department of Labor. They have an 800 number where they may provide some guidance. You might also check out the National Registry of Unclaimed Retirement Benefits.
Call the company that you worked for where the 401(k) was opened.