Cannot Figure This One Out...2006 Non Magnetic 5 Cents, No Mint Mark

There is a 2006 no P and no logo that is non magnetic. I have a hole roll of them.

Check it out

https://en.numista.com/catalogue/pieces3587.html

In 2006 there were 3 variations of the nickel.
The plated steel with both the "P" and RCM Logo
as well as over 43 million minted without a marking in Cupro Nickel, .75 copper .25 Nickel.

The mint has stopped using nickel for 5 cent coins in 1982.
From 1982 to 2001 5 cents were made of cupronickel which is not magnetic.
That applied to business strikes, PL, Specimen, and Proof.
So, if you find a magnetic 5 cents from that period it would be an interesting error.
There are 1999P (test), 2000P, and 2001P that are plated steel and magnetic.
2002P - 2006P and 2006 logo - today BS, PL, and SP are all plated steel.

I guess the mint had some surplus of cupronickel alloy or planchets
that they decided to but into production rather than recycle in 2006.
Another thing about cupronickel 5 cents is that they are prone to yellow toning, particularly 1982.
For that year I could not find 5 cents coins that do not have at least some degree of toning.
Maybe the alloy was not CU.75/Ni.25 but slightly different.
Those with access to an XRF may know.

don in nmkt what if the coin is a proof. that made of silver non magnetic.