I ordered a mini-fridge from a seller on Ebay. It showed up and I haven't even got a chance to set it up. Now two days later a second exact fridge showed up addressed to me. I checked and wasn't double charged. What would you do?
Some years ago, I bought a 40" flat panel TV at Sears.
I picked it up immediately at the customer pickup area. The kid working there didn't seem to know what he was doing, but I got the TV and brought it home.
A few days later I received notification that my TV was ready to be picked up and I could come in any time and get it.
I could have easily gone there, picked up another TV set, brought it home, put it up for sale on Craigslist and gotten most of my money back. But I just couldn't do it. I notified them and let them know I'd already picked t up.
I'm not claiming to be a saint. If I got an extra few bucks in change back at the store, I might keep it, depending on the cashier's attitude. If I found a $20 or $50 bill in the parking lot, I'd probably keep it.
But something like keeping a TV was just too much.
I don't know what your mini fridge cost, but if it was much more than a hundred bucks or so, I'd contact them and at least give them the opportunity to send a UPS or FedEx driver out to pick it up. Likely they'll just not take the effort and let you keep it. But you'll be able to feel better about yourself.