Need help on a pair of WWII era poster boards

[mope540]

I was asked to research a couple of WWII era "6th War Loan" poster boards that were recently recovered from a bank being renovated. After spending hours searching the internet I have yet to find any like either of them. These are made of heavy paper board and measure 29 1/2" x 42". The colors are very bright because they were hidden behind a wall for many years. As the story goes...after the war, that bank was remodeled and a newer wall (which has recently been torn down) was built and the posters have stayed hidden behind that wall until now.
My question (actually the owner's question)...does anyone know the value, or can offer any leads on collectors who can appraise them??

Thanks for any info!!!!