Farrah, forgive me for I may have sinned:
My wheelie bin went missing once, so I looked down the street and took a bin that may or may not have been mine, and painted my house number on it. I'm not sure if I should be sorry or not. There's nothing in scripture to advise me on that one, not that I'd trust it if there was, and I've not found anything in the philosophy of ethics that covers it either. My instinct tells me that it was a little bit naughty of me but that I shouldn't beat myself up about it.
I'd be sorry if I found out I'd nicked a bin belonging to somebody innocent who needed it, but I think the probability of it is incalculable, and it happened so long ago that it would be practically impossible to find out what actually happened. I suppose I could absolve myself by buying a bin and donating it to somebody who needed one, but for all I know I might have just stolen my own bin back when I originally committed that possible sin, and in that case I'd be out of pocket. I feel my moral duty is limited to not doing any overall harm to the world, and doing good at my own expense is just an optional bonus.