A friend of mine borrowed a lens from me while he came in town a few weeks ago, when he went back to New York he forgot to give the lens back to me so he decided to ship it back to me.
He used USPS Priority Mail and sent the package out on Friday, but so far the tracking status of the package is stuck in 'Electronic Shipping Info Received'. The track status did show 'Manifest Ack' for a very brief period but now the 'Manifest Ack' is gone.
Does USPS update their tracking status during weekend? What is this 'Manifest Ack' thing?