I am pleased to meet you too. First I do think you have a lot to complete you search successfully.
( = correct names , place of birth and living , perhaps participation in the WW2 … )
So , you have to learn if those materials are still in a local ZAGS. They might pass them to a state archive in Dnipropetrovsk might not . Sometimes archives demand materials much earlier then necessary.
It is even better if they are still there. We have to find someone who could come to them and solve the problem ( you don’t need any official papers for restitution ).
I would strongly recommend you to read phone directory for Nikopol. The name is very rare ( and that is good ). I would call anyone with Jewish name and ask to help.
До you speak Russian /Ukrainian ? Where do you write from ? Will think more…