Social Security still issues some checks to Supplemental Security Income (SSI) recipients. What happens if they don't cash those checks? The Department of the Treasury, which actually cuts the checks, notifies Social Security that a check wasn't cashed within a reasonable time. You'd think that Social Security would then check to see what was going on. Is the intended recipient dead? Is the intended recipient in prison? Is the intended recipient in a nursing home and no one is taking care of his or her affairs? There's lots of possible explanations why a really poor person wouldn't cash a check and most of them suggest that Social Security should check to see what had happened. A recent report of Social Security's Office of the Inspector General suggests that most of the time nothing is done. Specifically, in 100 cases picked at random, nothing was done in 87 cases.
This sort of laxity can happen at any agency at any time but it's been happening a lot at Social Security in recent years and lack of adequate funding has a lot to do with it. There aren't enough warm bodies to get all the work done.