Look up BSA/AML.
Basically, lawmakers/law enforcement has drawn a circle around what is considered "normal" account activity, and anything outside that is considered highly likely to be criminal.
Taking out the 10000 will normally trigger a CSR, and possibly an SAR. Moving 10k in the system is fine since the institution will maintain records for 7 years where the funds came from and go, and make reports to the local tax authorities.
Anything going to cash is going to be very high friction/risky. Making a couple large, individually < 10k withdrawls to cash which added together total more than 10k are explicitly called out examples to illustrate what "criminal structuring" may look like.
Structuring, is defined as the act of engaging in financial activity with the explicit intent/purpose of trying to circumvent or avoid triggering reportable events. It is a federal offense, and the Feds have absolutely no sense of humor around it.
Financial institutions are strictly liable for failure to comply with BSA/AML. They will not tell you any of this generally as a favor to law enforcement. I will, because info asymmetry is the root of all evil, and I try to trigger as many controls rqqas often as possible to specifically annoy those who deem such activity abnormal/criminal. It probably won't change much, but I resent outliers been sus by default.
https://www.occ.treas.gov/topics/supervision-and-examination...