Most of the e-tailers (electronic retailers) choose the DHL Global Mail Packet and Parcel services. The Standard shipments are partly (e.g. major mail facility at origin) traceable despite your vendor tells you it’s not possible.
But wait, if you know the DHLGM #, you can do that at http://webtrack.dhlglobalmail.com/?trackingnumber=(add your 16-digit barcode no. here). You may ask your vendor for that.
The mail pieces will be delivered by the local Postal Administration services in the destination country.