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I'd be more concerned about theft than freezing; local thieves are attracted to cars with out-of-state license tags. Marching bands perform in sub-freezing weather, so having brass instruments in cold storage shouldn't be a problem. If you're still concerned, many sedans have a pass-thru to the trunk; see if you can use that to allow at least a few molecules of warm air access to its contents. An extreme precaution would be to have the horns in the cabin, and put your wife in the trunk. This might cool your relationship with her, however.

@Dr-GO Red wine cork for rose brass, white wine cork for silver plated instruments... chips of plastic champagne corks for Chinese-made TSOs...

@Trumpetb

The only problem is making it out the door without sampling their wine.

That's a problem?!?

Thomann are offering different sizes of waterkey corks as well as different thicknesses of cork sheet to cut your corks out of.
https://www.thomann.co.uk/search_dir.html?__cTr=7bedffb2-1e7f-45de-be1e-2790c2f1c4c7&shp=eyJjb3VudHJ5IjoiZ2IiLCJjdXJyZW5jeSI6NCwibGFuZ3VhZ2UiOjJ9&reload=1&sw=cork&smcs=a935ee_13621

As your question is resolved, I will close this thread.

@Gendreauj said in Schiller elite pro Shepherds crook cornet:

I have owned other PRC cornets and yes it is definitely a crap shoot. I appreciate the tweaks ACB brass did on my cornet. The Wisemann took over a month to break in.
The Schiller was so cheap, thought the cost of any repair would be minimum.
Recently bought a Holton 602 RC it was made in Japan. It is a clone of Yamaha model.
Did find the bottom caps of the Holton and PRC cornets are interchangable.
Would the bottom caps of Yamaha trumpets and Yamaha cornets be the same size?

Yes, the Yamaha bottom caps should be identical.

@Gendreauj said in Schiller elite pro Shepherds crook cornet:

Today I received my recent inexpensive used cornet purchase from eBay. Cost of cornet was $85.00 dollars. Total cost was $106.75
Very impressed with the overall condition and it does look like a new horn.
Dissembled it and give it an extensive bath, cleaning, wipe down etc. Added fluids , reassembled the cornet and played it.
Did notice the excellent articulation, projection and ease of use.
Also noticed both of my cornets are identical in many ways; Other than the color it reminded me of my other PRC stencil cornet. Both cases are the same except for the logos. The valves and slides are interchangeable. The bottom curve of the shepherds crook is the same in both cornets.
Where it differs is the Schiller cornet has heavier valve caps than ACB cornet. Another difference is the unmarked mouthpiece is a different size than the other cornet.
My conclusion is both cornets were assembled in the same factory in China.

They likely were. The ACB does come with a guarantee from Trent Austin, and he tweaks them after the factory. The PRC Cornet is a crapshoot. But, I'm glad you're happy with the one you got.

@Trumpetb In principle, you are perfectly right. But in this case, the insrument in question is a relatively modern, almost new instrument of Chinese mass production... The main question here is, whether it is worth while going to any length to achieve this for ths kind of instrument...

Why not just swap the caps between the 2 instruments, the bottom caps do not matter but if the top caps are of a different thickness the valve alignment will be effected.
If you are adventuress there is a great number of DIY copper plating instructions on youtube,

Regards, Stuart.