We import the vast majority of our stock.

Ours all comes in as normal boxes that a single person can carry and valued at under $1000AUD.

We never have any troubles with anybody. Sometimes customs open them for inspection and if they do they attach a label that says so.

The O/S shipping company send it via whatever carrier they use and its delivered to our door by the Aust carrier. That could be AP or DHL or whoever. We never have to go thru any of the dramas you indicate at all.

The address labels always carry our phone number and email address just in case contact is required, but it never has been.

I'm thinking you must be dealing with a very large quantity in which case I would think you will need to employ the services of an agent here.