I am sure you can choose to take cash or Wire transfer.
I personally would do a Wire Transfer instead of Risking it with the cash. Someone knows he hit the Jackpot, he takes the cash, some people plan to hi jack him on the outside or something. So I think Wire transfer would be the best idea IMHO.
In South Africa if you hit a Jackpot like that, the Casino Notify the Tax man that x Amount was paid to you and come Tax Season you need to declare you won 100 k in the casino, luckily you are not paying any tax. The Tax man just need/want to know about it.
Unlike Poker Event winnings, WSOP for example - Where you basically pay taxes immediately.