Title27/CFR/
§ 478.124 Firearms transaction record.
(a) A licensed importer, licensed manufacturer,
or licensed dealer shall not sell or
otherwise dispose, temporarily or permanently,
of any firearm to any person, other
than another licensee, unless the licensee
records the transaction on a firearms
transaction record, Form 4473: Provided,
That a firearms transaction record, Form
4473, shall not be required to record the
disposition made of a firearm delivered to
a licensee for the sole purpose of repair or
customizing when such firearm or a replacement
firearm is returned to the person
from whom received.
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..."shall not sell..'or otherwise dispose'..."

The firearm is logged in,,then it's going to a be disposed of to a nonlicensee, wether it's the original person who sent it in or not, then a 4473 is required of that person or must be shipped to an FFL in the nonlicensees state if nonlicensee be O/O/S. There's nothing that exempts the original owner/seller from this requirement when retrieving the firearm after being sent to the FFL. Only if it was sent for gunsmithing work.

The rest of *478.124 gives the proper procedures to follow in making out the 4473, what constitutes proper ID, etc.