Blank Ammo Question

Asking because I truly have no clue of the answer so, I'll ask you guys.
I came across about 1000+ blank ammo rounds.
All are 30.06 and WWII era. All for M-1 Garand or 1903 Springfield rifles.
Do these things have any value?
Are they useful for reloader's or is the powder of any value?
They look like the pic below.
I ran a few thru a M-1 and had a 50/50 success rate on them firing. Mostly they made noise and made the rifle dirty.
Just not sure what I want to do with them going forward.
Let me know what you think.

blank.jpg