I did. Apple then called UPS and started an investigation.
After 5 hours - in which I've called UPS 5 times - UPS was in contact with the "new (wrong) MBP owner" but UPS wasn't able pick up the package, so they asked me to do it. And I did.
Typing/writing from it now and love it.
I'm expecting a economic compensation from UPS though Apple.
Wow. How much do you think you'll going to get?
And does a "wrong" owner have to pay any penalty for just... taking your stuff if they don't find a way to contact you?