Such as nickels, dimes and quarters? Where have you had the most luck (convenient stores, grocery stores, banks, etc.)?
Do you think the bank goes through each and everyone one of their coins?
Does the bank go through each end everyone of their coins

Some do, some don't!
I went to a bank yesterday to pickup a box of half dollars....I was about to get it and my friend showed up out of nowhere, who happens to work at that branch. Guess what he told me

??
"THERE IS NO SILVER IN THERE!" haha. I'm like how the heck do you know

?? He said that he went through all of them! I told him that someone already looked through them, that's why there isn't anything in there.
I picked up another box from the same branch about a week ago and one of the tellers told me that some guy goes there and dumps bags of loose half dollars (which is completely stupid. I always re-roll my halves and give them to the tellers, that's why I have absolutely zero problems when i'm returning my $500 boxes).
I told him to go through the boxes when that guy orders something, take out the silver ones, re-roll them and then give the box to that moron.
Dumping 2000 coins in a bag on a tellers desk is not cool. I hope that moron learns his lesson.
If you treat the tellers with respect, then they'll treat you with respect too. They ended up giving me an unsearched box, from which I found a 1954 Frankling and a couple of Kennedys.
Good luck.