Couriering a spring air rifle

This might help more.
Its a response to asking about shipping an bbpistol in nz.

Yes, a mail order permit is required. see the excerpt from the Arms Act below;

A person must not sell by mail order or on the Internet any item specified in subsection (2), otherwise than under a written order—
(a)
signed by the purchaser; and
(b)
signed by a member of the Police stating that the member of the Police—
(i)
has inspected the purchaser’s firearms licence; and
(ii)
has inspected, in the case of an item specified in subsection (2)(d), the permit issued to the purchaser under section 35AAA; and
(iii)
is satisfied that the purchaser is a fit and proper person to purchase the item; and
(c)
recording, in the case of the sale of an item specified in subsection (2)(a), (b), (c), or (d), the marking on the item.
(2)
The items referred to in subsection (1) are—
(a)
non-prohibited firearms:
(b)
non-prohibited magazines:
(c)
non-prohibited parts:
(d)
pistol carbine conversion kits:
(e)
airguns (other than an airgun for use in airsoft or paintball sports):
(f)
ammunition (other than ammunition for a firearm of the kind described in section 22(1)(a), (b), or (c).
(3)
A person must not sell by mail order or on the Internet any prohibited item, pistol, or restricted weapon, unless—
(a)
the purchaser has obtained an endorsement on their dealer’s licence or firearms licence that authorises them to possess a prohibited item, pistol, or restricted weapon; and
(b)
the purchaser has, in the case of a prohibited firearm, prohibited magazine, pistol, or restricted weapon, obtained a permit to possess that prohibited firearm, prohibited magazine, pistol, or restricted weapon; and
(c)
the prohibited item, pistol, or restricted weapon is delivered by a courier specified in the permit referred to in paragraph (b) or, in the case of a prohibited part, a form specified by the Police.
(4)
A person commits an offence and is liable on conviction to imprisonment for a term not exceeding 6 months, or to a fine not exceeding $10,000, if the person, without reasonable excuse, contravenes subsection (1) or (3).
Section 43A: replaced, on 25 June 2020, by section 70 of the Arms Legislation Act 2020 (2020 No 23).

It depends on the store you drop it to. You can’t courier it as it will look like a gun package and likely be stopped. Police form depends on the store sending from; someone who doesn’t do much with Airguns will likely treat it as a firearm, whereas young’s will send it out without police form (but would be required for pcp)