Stolen iphone 14 pro location updated 3 days after the sim was blocked

Well, the other possibility is the Find My network. This is a crowd-sourced feature; another iPhone that is near your lost phone can detect its Bluetooth beacon, even if the phone is off, and report its location to Apple who then forwards the location to you.

Ever wonder about that phrase under the slider to power off the phone?

The phone is still "On", even if it has been powered off.

"iPhone Findable After Power Off"

The phone sends out a very brief but intermittent Bluetooth signal that can be picked up by other iPhones and iPads in close proximity. Those devices forward information about the location of the phone to the Find My servers.

The phone will continue to send out a signal until the battery runs completely down. In some cases, that means that the phone can send out a signal for a few weeks if the battery power holds out.

Unfortunately, thieves know all about this, so they often place a stolen phone in a special type of bag that will not allow the phone to send or receive a signal.

The location updates when the device is powered, and connected to a network.

See Find your lost iPhone or iPad with Find My - Apple Support

If it shows offline in Find My how did you receive the updated location?

Beware of a common phishing scam: You may get a text or email from “Apple” or “Apple Security” (or sometimes “Police”) saying your phone has been found and to click on a link to see its location. This is NEVER from Apple or from law enforcement; it is from the thief or fence to steal your Apple ID and identity. Delete any such message without responding to it. Apple never gets involved in lost or stolen devices→Avoid phishing emails, fake ‘virus‘ alerts, phony support calls, and other scams