The head stamp may or may not identify what they are.
Clean one by dropping it into a 50/50 solution of hot water and vinegar, and see if there are any markings. If you will take an accurate caliper and post the dimensions of the cases, bullets and loaded cartridges, we should be able to identify them fairly quickly.
I've attached a drawing of a .38 special to give you an idea of what we need.
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