It looks like they cancelled the service in favor of an online app?! Weird reasoning to me: “Oh, in a few years we may be able to provide this service online, although we’re not sure, but anyway, later!” Based on links below, I guess the post office stopped helping at the end of 2018, and convenience stores started providing cash (again? Didn’t they do this, long long ago?) at the start of 2019.
As others have said in other threads, yes, you can get cash for $200 at convenience stores (and I think $1000, but I haven’t won that in a while), but the efficiency at which this may be done varies widely from branch to branch.