I'm unsure that it means, like sending parcel post by postal?
If, I understand right. In Thailand have staff for check size of the box, and weighed. If exceed the standard have will cost. Because have register this.
Besides, in Thailand have to send this parcel post by special delivery (ems). Which have costs is similar but take delivery faster.
I don't understand that Why must use machines running to dry your house to 4-5 days?