Schankwart,
I can offer that a couple of months ago Silver Sands (which was my listed casino) cut off US Players with no advice to anyone - it took a call to support to get that information. My players disappeared and that's what made me suspicious.
Numbers I have - listed on the Silver Sands contact page :
Casino Support - 1-800-769-4836 (this is the number I called and got Customer Service)
Portvale Corporation Ltd., 74A Ayios Eleftherios Street, PO BOX 28770, 2082 Nicosia Cyprus - 1-800-769-4836
there's an email addy listed for the Cyprus address, but I doubt it'll do you much good
helpdesk@silversandscasino.com
Hope this is helpful,
ntaus