Just saw a hilarious definition and then a spot-on definition.
The funny one:
What does Origin Post is Preparing Shipment mean?
It means that the item is already in the country to which it was sent to. So, if you had ordered something from Canada, and you live in the United States, it means that the item is already in the United States and is preparing to be shipped by the USPS. Origin Post is a company that takes the items from overseas and sorts them.
EDIT: Origin Post is not a company. Origin post = place where it's being shipped from's post office/system. So, it's not in the US.
The spot-on one:
Origin Post is Preparing Shipment "Real Meaning" (USPS)?
It means that the origin Post is preparing a shipment for dispatch. basically manifesting packages heading for the US. Most often, a foreign post will merge all of the packages going to one country and list a manifest of each individual package and their tracking numbers, if applicable.
Once the container is full enough, it is passed to be dispatched. When the container is scanned, the status of all of the packages on the manifest will update.
From what you posted, though, your package was dispatched at 1241 hrs this morning. Once it clears Customs in the US, it will be handed over to the USPS for delivery. I would not get worried until Wednesday, at the earliest.
26 year Postal Worker
And I was just playing around putting the term in search after checking the tracking status of a couple of overseas shipments of mine from Hong Kong and China. For days each said , Origin post is preparing shipment. Today, the tracking seemed to have updates through 17track.net when I clicked on details.
The first one, a set of headphones and coming from Hong Kong, tracking said:
2013-12-05 00:00, The item (RBxxxxxxxxxHK) left Hong Kong for its destination on 5-Dec-2013
The second one was this wooden miniature kitchen:
Nothing fancy, just imagination toys to go with the dolls I purchased from a seller on ebay (that are like the dolls in the kitchen pic).
The tracking details on that shipment was this:
2013-12-05 00:00, 出口总包直封封发, 深圳国际, 美国
2013-12-04 00:00, 出口总包互封开拆, 深圳国际, 美国
2013-12-04 00:00, 收寄局收寄, 深圳市国际大宗邮件处理中心, 美国
Which translates to this:
2013-12-05 00:00, exports total package seal seal straight hair, Shenzhen International, USA
2013-12-04 00:00 Mutual export total package seal to open, Shenzhen International, USA
2013-12-04 00:00, acceptance acceptance Bureau, Shenzhen International Bulk Mail Center, United States
Which looks to me like they opened it to inspect the contents then sealed it again.
Looks like they're coming along!
Edited on 12/8/2013 at 12:53 AM. Reason: