Someone stole my iphone? What message should I leave them once they turn it back on?

I'm erasing my iphone because I know for a fact I can't get it back because someone in Mexico stole it from me. What message should pop up on the phone once they turn it on? I'm shook they had the nerve to steal it. It had a cracked screen lol. And it's pretty much old. Anyways, best response gets best answer. Thanks

Added (1). I already reported it. There's nothing else to do LMAO. I'm getting it replaced soon so yeah!

Forget leaving them a message, report it stolen to your carrier, get it blacklisted, that way they can't use the phone or sell it. Change any automatic log in type passwords you have on any apps, just in case you don't lock your phone, and it's been more than 60 mins since you first noticed the phone missing.

ICloud Lock it with a message saying "enjoy your fancy new doorstop"

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