Japan - NRT - local postage inside the transit area

wondering if anyone has experieces mailing packages from inside the transit area? I know there is a JPOST counter outside, but not sure if there is one inside anywhere. thanks.

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http://www.narita-airport.jp/en/guide/service/list/svc_23.html

"There is a mailbox in front of each security checkpoint in the departure lobby"

I assume that that's the last chance you'll have, and will not be able to mail anything once you've cleared security.

No mailbox airside. You can drop postcards off at the information counter. No facility for packages.
http://www.narita-airport.jp/en/guide/service/list/svc_65.html