...also if you make deposits just under $10k or make multiple deposits that add up to $10k+ in $ArbitraryTimePeriod they can be reported as suspected "structuring." Structuring is a technique to spread out transactions to avoid reporting. But it also catches people who just happen to have transactions that look like structuring. There was an example of a rural store owner that made deposits around $8k because that was their revenue and it got seized because the government thought they were structuring.

Yes. They also can flag you using Benford's law

https://en.wikipedia.org/wiki/Benford%27s_law

Nice wad of cash you got there, be a shame if you had to prove provenance...