Ali - please have a look:

https://www.youtube.com/watch?v=hS7VFc5tlfo
This one is called "Kogan Cave" in Lorestan. Is that the one you talk about or is it close and belongs to the same period?

https://www.youtube.com/watch?v=HSzzL29dQ3w
At minute 15+ some silver objects are shown. Again my question: Same area? Same period?

Do you know idea where the remaining objects are exibited in Iran?