I received form DE 731 in order to receive checks I never received. It was supposed to come with a blue envelope that I was supposed to mail back to them but it was not in the letter they sent me. Does anyone know the address or P.O. Box where I mail this form back to?

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I had the same issue with form DE 731! The mailing address should be: Employment Development Department, P.O. Box 826880, Sacramento, CA 94280-0001. You can also try calling EDD at 1-800-300-5616 to confirm the correct address or ask them to send you a replacement envelope. Make sure to include your Social Security Number on the form before mailing it back. Hope this helps!