A few years ago, in the UK, we received a surprise crate of wine (12 bottles). We hadn't ordered it and thought it might be a Christmas gift from FIL, who had done this before, but no.
So I called the company and it turned out the true recipients were the people below us in the alphabetical database. (We had ordered from them previously so they had our details.) When they placed an order, the operative had simply clicked on the wrong name or some similar simple error.
We arranged to leave the box round the back of our house so the company's delivery driver could collect it when he was next in the area.
For the next three months, we would bring that box inside every week on the day the refuse collection was due (so that it didn't get picked up with our rubbish my mistake) and then put it outside again. We also called the wine company every week to remind them and they kept saying they would collect it, but they never did.
Eventually, we decided to open the crate and drink the wine (which was very nice and much better than we would usually buy) and deal with any consequences if and when they happened.
Six months later we got a call from the wine company......to ask if we were aware if there was a credit on our account after we'd returned a case of wine ordered in error! It didn't matter how hard we tried to explain what had happened, the operative said the credit was showing on the account and we had to order more wine to clear it!
So in the end we did. I'm sure we committed some gross etiquette error in both drinking the original 'mistake' and then ordering more with the credit we should never have received, but we did make multiple efforts to rectify/explain matters.... To this day, it's the best wrong delivery we've ever received.