Bonsour Neil,
You might check the SS club site or Jim's site for casino's with SS machines and the machine placement there. Jim's site address is listed in the SS club site. Other then this I know of no other site that could tell you the information you are asking.
I will --from my experience - try to answer your question.
Only these Las Vegas Casino's has released any $200 silver strikes within about the last 1 to 2 years.

4-Queens
Freemont
Palms
Slots-A-Fun
El Cortez -- SS machines -- Are susposed to be temporarily out of service--hopefully they will be back in service

during the convention and a lot longer.

Las Vegas Club -- No SS machines anymore
Plaza -- No SS machines anymore
Mirage

I think that's all:: Please--Let me know if I missed any.
Of the above Casino's ONLY the 4-Queens has taken any of the older past silver strikes. As well as the newest strikes released there. For the present $200 being released at that time.. All the other casino's listed, in the past. Took ONLY the newest present strikes released at the same time as the $200 was released. Or if none released at the same time. Only the last $10's released.
Note :: the Slots A Fun did take on their last $200 strike release. A combination of the newest release and the release just before the $200 was released. As I understand it both series of $10's was from th same series. Only each part of the series was released at 2 different times.

I suggest that you watch strikepoint and the SS club website closely. For any other not listed casino's that may release any $200's in the future. And to find out what is requires to be turned in for it. As well as information on the listed casino's. As with anything --especially--with casino's any of this could change in the future releases of $200 strikes.
Someone please correct me if I am wrong about something here.

I hope this helps you, see you at the convention.

Dan