There could be several reasons why the SHEIN package not delivered. Here are a few possible explanations:

Shipping delays: Delivery services, especially during busy periods or unforeseen circumstances like natural disasters or extreme weather conditions, may experience delays in delivering packages.

Incorrect address: Double-check the shipping address you provided when placing the order. If there was a mistake or incomplete information, it could have caused the package to be misrouted or returned to the sender.

Customs or import issues: If you ordered from an international location, your package may be delayed or held up at customs due to import regulations, duties, or taxes. You can contact your local customs office for more information.

Lost or misplaced package: Sometimes, packages can get lost or misplaced during transit. If the tracking information hasn't been updated for an extended period or if it shows that the package is lost, you should contact SHEIN's customer support for assistance.

To resolve the issue, I recommend taking the following steps:

Check your order confirmation and shipping confirmation emails for any relevant information or tracking numbers. Use the tracking number to monitor the progress of your package.

Contact SHEIN's customer support: Reach out to SHEIN's customer support team and provide them with your order details and tracking number. They should be able to provide you with more specific information and assist you in resolving the issue.

If necessary, file a claim: If a considerable amount of time has passed, and the package is still not delivered, you may need to consider filing a claim with SHEIN or the shipping carrier to investigate the issue and potentially receive compensation or a refund.

Remember, each situation is unique, so it's best to reach out to SHEIN's customer support directly for personalized assistance regarding your specific order.