Just drain the can of sauerkraut into a colander and give it a rinse, that will take a lot of the salt out if you are worried about it.
It would be good if the sauerkraut works. While yes, a bird may be able to live with a screw, staples, pieces of metal stuck in the gizzard, body, etc...
Yay! Ya'll found the one I was thinking of that was sticking out.
I found these 2 as well. I do believe the 1st was removed surgically(?) I'd have to re-read the thread. Other one was not very good news.
This one was removed...
I have no idea if she can pass that or not.
Surgery would be very risky to begin with, but he may be able to remove them.
If he doesn't feel like he can, then research "Hardware Disease" and "Hardware Toxicity" in poultry, you will find information and perhaps be able to provide chelation or...