Entering USA with cash > $10K

[Cleopatra]

Does anyone have personal experience (no speculation please) of the procedure followed by US Customs officers when you check the box declaring you are bringing more than $10,000 of currency or monetary instruments into the country?

I know you have to complete FinCEN Form 105, but is there any further hassle? Do you have to show them the money? Do they routinely search the baggage of travellers who make this declaration?