How much are these worth? ‘Pet Stotina 500’ - Help Please?

Hello, 

I am cleaning and old family apartment from a recent death of an elderly family member and we came across monies that are no longer in circulation. Several bills in relatively good condition. Is this worth anything or would anyone be interested in them? 
I do not believe the bank will accept them as they had that option available years ago, but due to the war and events after they were never taken. I have tried looking online, but I can only find that it is no longer a currency and that is it. 
Open to any and all assistance - thank you! 

Below are a few photos of the different quality bills.

This series of notes seems to be less commonly found, few offerend to swap. Of course condition is important to collectors, as banks will not accept them anymore, and the bottom note might fetch you a few euro's in that condition. The top ones not so much.

Here is the note you're showing:

N#245946

Please note that you have two types of banknotes: with a large and with a small serial number. This information is not available on this site, so I cannot judge whether the variety with a small serial number is rarer.