[Chickensoup]

I remember this being a requirement on overseas packages in the fifties, for customs tax

[lastchance]

That is probably its purpose now as well. I have a feeling overseas postal agencies required this info and the USPS was obligated to go along to keep the mails going.

[Allegra]

I remember this being a requirement on overseas packages in the fifties, for customs tax

Yep. It still is. That’s why we never mailed water or Arizona iced-tea bottles with booze in them to ourselves over in Iraq while we were home on R&R. We never had our friends do that, either. {cough!}