Haven't seen any of those ever to be honest, but there might very well be some of them somewhere. Never pressed on silver for as far as I know, only on CDR I would say then or on other formats.
And now that we are talking about concerts we are after, I am looking for their gig at the Westergasfabriek in Amsterdam in 1998. I've been there and I would very much like it on CDR. Someone?