Not So
"Casinos are required, like other institutions and businesses, to report all cash transactions aggregating $10K or more within any 24 hour period. This is called a Cash Transaction Report or "CTR." Under this rule, for example, if you bought in for $5K and cashed out for $5K (i.e., broke even), you would still have aggregated $10K, and a CTR would be required."
The CTR requirement is not during "any" 24 hour period, it is defined as a gaming day which is a 24 hour period set by each individual casino. The Gaming day usually starts/stops when the casino empties the table cash boxes at the start of a new shift/gaming day.
Buying in for 5K and then cashing 5K DOES NOT generate a CTR. A CTR is only generated if your aggregate buy in's exceed 10k OR aggregate cash out's exceed 10k (i.e. 10,000.01) during a gaming day, they do not combine the buy in and cash out to arrive at the total. The CTR does not mention whether you won or lost, it is only a record of the transaction occuring.
"In short, you really didn't have much choice but to supply your SSN. The good side of this is that the loss is recorded, thus can be charged againsts future wins."
He did have a choice, once he approached the 10k mark he could have not bought in again that gaming day. Before they gave him chips for his last buy in which put him over 10K the casino will ask for your SS info, if you refuse they will not allow you to buy in again during that gaming day.
If your last buy in went over the 10k limit and they gave you chips without having your SS number, but later discover you were over the limit, they will then ask you for your info. If you refuse to provide it, they will stop you from playing in that casino again until you provide the information necessary to file the CTR.
If you are a rated player, once you give them your info the first time, they won't ask for it again on future trips because they will have it on file with your player records. Then the next time you go over 10K either in buy in or cash out, they will file the CTR without you even knowing it.
BTW, once a casino has your SS number it's safe to say that Griffin and the Central Credit Bureau also have access to it.
Once again, a CTR does not specify whether you won or lost, it merely records the buy in or cash out for any amounts exceeding 10K (i.e. 10,000.01) therefore, a CTR is not a record that can be charged against future wins.
Hope this is helpful.
Card.