I don't think any of the major suppliers are culling silver, it's not their money, it's their customers i.e. banks going to virtual vaults if you will.
If brinks, Garda, Loomis whoever wanted to cull silver they would have done it years ago. Its just not their business model, they are money transporters/processors.
In order for them to cull silver they would have to obtain coinage with their own funds from a bank or the fed, not deposits of institutions or businesses.
It is entirely possible that there are people within the organization breaking the rules at sorting centers. But based on my research and directly speaking to the operations manager of Brinks and Garda for Los Angeles, the first sentence I typed in this post is directly from their mouths, not just my hypothesis.
Hope that helps, you will have good days and bad days. You will have good weeks and bad weeks, etc. 10-20 skunks is nothing. 100 might raise my eyebrows.
The reason that the saying "Volume is King" in this hobby is not because every box produces and you simply make more money. It is about persistence, persistence, persistence, did I mention persistence? By doing large volume and large sample sizes you are increasing your odds of hitting the section in the pallet that got Grandpa's collection.
Granted some areas are better suited to CRHing (and I'm not talking East Coast), what I mean is metro areas vs. rural wheres theres only 2 banks in town or something like that.
Anyways, I think I answered your question and then some.
HH
Bigheed
This question again
