USPS site is on the fritz. No tracking; this is all that comes up.
#cososec
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I suspect this may be just site maintenance. Found this in source with several earlier ones, though nothing mentioning anything in October.
<div class="g-alert"><p>Alert: On Sunday, September 26, some of our applications will be unavailable from 4 to 8 AM CT while we perform routine maintenance. We apologize for any inconvenience.</p></div>