I haven’t worked in a while and despite this I’m still getting paid

It’s agency work, basically sent to wherever (if there’s a spot available) I have nothing from my boss for quite a while, but despite so, I am still getting paid every Friday (it just happened now) I believe it’s an error but I’m not complaining, I absolutely love it. But I fear that my boss would ask if I got paid for the weeks where I did not work. Am I overthinking this or is it best to just keep my mouth shut and deny any knowledge?