Two of these official cards from Post PNG are available, showing “Customary burial ground”.  The card has a “Domestic Postage Paid Papua New Guinea – Additional Postage required if sending overseas,” and the postal clerks insisted on full additional postage … OK, lah.  One card is unused (Grade: 1, $8) and the other was mailed with two stamps and postmark in 2017 (Grade: 1, $14).