The paragraph quoted by @JeanneAdil is for standard visitors and does not apply to people relocating to the US, that's covered under CBP form 3299: https://www.cbp.gov/sites/default/files/2024-05/cbp_form_3299_0.pdf. I had half a container of stuff including a 70" TV and some very expensive bikes - no issues, didn't pay a cent, but my mover handled all the paperwork. All descriptions were on a per-box basis, not per-item, for example "Clothes", "Shoes", "PC items", "Toys", "Kitchen Machines".
They did caution me to not include alcohol since that could delay clearance, so my coworkers got 25 bottles of very nice Scotch, not worth the potential hassle though they were worth a few thousand dollars.