No need to worry. A few things may have occurred here:
Carriers often mark packages as delivered in advance, and actual delivery can take up to another 24-48 hours. If this happens, please reach out to them when you do not see your package after this delivery window.
A friendly neighbor may have accepted the package on your behalf for safekeeping. They also recommend double-checking all entrances and garages.
Please confirm your shipping address matches the address on your order confirmation.
If you still haven't seen your package after the above steps, please reach out to them at hello@neiwai.life.