most of the local banks wont sell bags because of "policy" So i do try to dump in multiple areas in order to get bags sent in, hence spending them on everyday things too as that will fill bags that cant be sold.
I will go though my own dumps on banks that will only sell a full bag.
When I go into a bank and they say the half bag has never been sent in in the time they have worked there but they can sell when it hits $1000, and if its in the $500's or higher full, I ask if I can fill the bag to buy it. They think for a sec, and are like, sure!
All they care about is the accounting coming out right. Its in those bags I find a lot when I can find em. So yes, its worth searching though $500 in dumps or less or even $900 if there is silver in there.
I also dump in amounts that fill several bags. If I go and dump 3k in halves, thats going to fill several bags. Of course I dont buy them, But I also only dump at banks that send in and have the Dont sell the bag policy.
My goal is to get as much deposited silver before it goes to the fed, that way I can stop it at the source, and find out witch banks have a higher probability of a silver depositor or multiple silver depositors bringing in halves. the banks that sell the bags are also good to go after other coins as well. Particularly if you find parts of a collection. the rest may be in the machine. Its better to get the deposited collection than the scattered remnants that you find in boxes after being diluted down with others.