I get paycheck from Delloitte, but i never worked for them

Hi All,

I would highly appreciate any piece of advice on the following matter:
I was supposed to start working for Deloitte this Summer, but my offer was terminated by the firm 2 months before I even started working for them

Surprisingly, I got a signing bonus from them recently and since my offer was withdrawn by the firm I sought that I was entitled to the check as I have actually accepted the offer and even moved to a new location...

Well today I got a paycheck from Deloitte- which I'm definitely not entitled to.

being an honest person I will certainly return the paycheck.

my question is whether anybody ever had a situation like that?