How come my tracking number doesn't work?

How come my tracking number doesn't work?

Seeed sends shipment notification and tracking numbers as soon as orders leaves our warehouse. Tracking numbers will likely not show any result before carriers have a chance to do an initial scan to those packages.

For Speedpost Global Express and USPS packages, this delay is usually 1 business day. For airmail packages, the delay can be up to 3 working days.
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