BigMoss, I've found a box with 303 silvers in it. Sounds great doesn't it. People like to talk about their finds. There well documented. 2 weeks after finding the 303, I began a very very long journey of OVER 40 boxes without a single silver. Now here's the interesting part. The box with 303 silver and the skunk streak happened with exactly the same type boxes, same wrappers, same bank, same branch. That was 3 years ago. I've gone on many streaks since then. I've had a few skunk streaks of ~20 boxes. I'm currently on my best ever streak of boxes containing silver. The point is that you LITERALLY can't determine anything from 1 box. You can't determine much from 10 boxes. I'm hundreds of boxes in to the same bank and I have no idea when my next long skunk streak will come, but I know it will come.
When I started this hobby, I had a 100 different conspiracy theories going through my head about what causes silver to "disappear". Why has the 'silver vein dried up'. I finally figured out there are people participating in this hobby on a scale that most of us can only imagine. I believe there are individuals, that likely own or work for a bank, processing hundreds of boxes at a time. You never know when you're going to run in to a brinks or loomis pallet with box after box of someone's dumped coin. On the flip side, you may find a box where someone's father or husband dies and the family just deposits his coin hoard. It's really impossible to determine what bank or courier is best in your area. It's all about quantity and luck. Good luck if you decide to stick with it.
OO