I also heard a rumor that Brink's has a machine that filters out the silver from the rest of the dimes.
And that's what it is, a rumor.
I have been told that all 3rd party coin rolling companies are using silver sorting machines.
Complete rubbish. Coinstar may or may not be doing it, but all processors, nope. We wouldn't be finding silver in the Brinks and CWI processed coins if that were true...
This is second hand info...
Lots of people do get silver dimes from brinks rolls (I get more silver that way than from halves, which are terrible for me), so they're not culling it, despite constant rumors to the contrary. But if you live in an area with lots of roll hunters, they've probably sucked most of it up.
I find silver in Brinks rolls as frequently as I do CWI rolls.
Just a friendly FYI, it is quite erroneous to refer to the paper wrapped rolls processed by CWI (Coin Wrap Inc.) as "string" or "String and Sons" rolls or boxes, or any other cute nickname I've seen on this forum.
N.F. String and Sons only make the wrappers and boxes. They do not, and never have, ever processed coins. And CWI is not the only coin processor to use these materials. There are other regional processors that use these same wrappers and boxes.