Hello Tim and, as one of its members, welcome to the GMIC!
We love to see your Netherlands and Belgium militaria, if you care to post any of it.
"the medals were found by the people who cleaned if afterwards in and old blanket chest in the attic..almost a to good to be true story..."
Yes, it is a good story that all medal collectors love to hear. Furniture sold in auction, but the blanket chest was overlooked. Medals on the death pillow, but none of the funerary ribbons, dried flowers or funeral cards and well-wishers that a family would keep from the ceremony. All very clean and with no extraneous detritus.
From what you told us there isn't much to evaluate on further, however since these medals came from castle that the inhabitant just died, it would be valuable to know which castle. From there, it shouldn’t be too hard to learn the names of the last owners (important, because it might not have belonged to the last occupant). I think this will narrow down the recipient faster than the known 73 awarded Waldeck list would.
...But we really need the name of that castle.
As for the medals; this does look like a real Ordenskissen, but I have my doubts that it is a period assembly. The medals and orders appear real, but they are all individually parade mounted. The layout of the medals on the pillow looks a little modern to me. Do the medals even belong to one man? The Centennial medal ribbon is filthy(a good sign), but the Red Eagle's ribbon (similar age) is pristine. The VW has rust(?).
Could use some better photos of the awards, and reverses. I know that you will have to remove them from the pillow, but this will also let you examine the pin holes in the pillow. If these medals were attached undisturbed for the last 80 years they will should look like they have been undisturbed for 80 years.
There is more to learn here....