@rexmakesbeats well technically USB-C ports are in fact USB ports, but it seems you're asking where the USB-A port(s) are. On the newer vehicles like yours, the only USB-A port is the one inside the glove box, which would have come with a Tesla-branded USB stick pre-installed for your Sentry and Tesla Cam recordings.
For Boombox sounds, does it load the custom sounds from the drive into internal storage, or does it always need the USB drive present every time the clip is played? If the latter, your safest bet may be to pick up a USB-A female to USB-C male adapter and use one of the two ports in the front console.