DTVape will always try our best to ensure all parcels are delivered within schedule securely. For the reason we do not have any control on the third party delivery companies, lost parcels still happens under unexpected circumstances.
We will always suggest customers use Signature-Required Service for all parcels. This service ensures all the parcels are signed by the recipients. Our insurance policy will only cover those parcels with signature-required. In another words, if your parcel is lost with the courier,  we will send you another one to replace your lost parcel. 
Customers can still give authority to leave parcels without signature when they are unavailable to sign for their parcels. However, It will be ON YOUR OWN RISK if you require the courier to leave your parcel WITHOUT SIGNATURE. Courier drivers will leave your parcels in a relatively safe place. However if the parcel is lost without signature-required, DTVape is NOT responsible to any lost. Therefore, we highly recommend our customer DO NOT give authority to leave your parcel without signature for safety reason.