The federal law here is about theft
On this page14
There is a federal statute that names a key
And what it prohibits is stealing, purloining, embezzling or obtaining by false pretense a key suited to a Postal Service lock, and making, forging or counterfeiting one.
With a penalty of up to ten years
Shall be fined under this title or imprisoned not more than ten years, or both. Which is a serious provision about a narrow thing.
And it says nothing about containers
No labeling, no marking, no packaging and nothing about selling key blanks generally.
Which is the finding for this group
Across this library the usual shape is a rule that constrains a package. Here the federal provision in the neighbourhood is about a crime.
So the packaging question stands alone
Which is worth stating plainly rather than stretching a statute to reach it.
The category it describes is very narrow
A key suited to any lock adopted by the Post Office Department or the Postal Service and in use on any of the mails or bags thereof, or a key to a lock box, lock drawer or other authorized receptacle for mail.
A padlock blank is not within any of that
Nor a lock pin, nor a tumbler spring. The four leaves in this group are outside the description.
And the second limb has an intent element
Knowingly and unlawfully makes, forges or counterfeits any such key, or possesses any such mail lock or key with the intent unlawfully or improperly to use, sell or otherwise dispose of the same.
So possession alone is not the offence
The limb requires an intent unlawfully or improperly to use, sell or otherwise dispose of the thing.
Which is the whole of what this property says about law
One page. The remaining five are about the container, because that is the part a packaging catalog can speak to.
And nothing here addresses the rest of the subject
Locksmith licensing, restricted keyways, key duplication and whether any mark has legal effect are all outside these pages.
Nor would anything here help defeat a lock
Which is worth saying on a page about lock parts, and is a line this property does not go near.
The container finding is a material split
195 plastic containers against 56 glass, and for a small steel part that is a real decision rather than a preference.