Here are the detail instructions on how to get a copy of your benefits verification letter online; it's not a bad as it looks, I just wanted to include everything so you don't show up in the wrong place:
Try this link it is a more direct route:
Click on the Sign In or Create an Account
then either set up a "My Social Security" account or sign into your existing account.
scroll to the bottom of the Terms of Service page and "agree" to their terms
then click on "Replacement Documents" at the top of the page.
Click on the section where you may include what you need in the verification letter.
click "OK" to continue
You can view it, save it, or print it; whatever you want
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Thanks very much,