Perfectly prepared to be told I ABU but I'm interested to see what people think.
A few weeks ago I ordered something online, delivery was 3-5d and it was posted Monday morning, the day after the order, so reasonable to assume it would arrive in a couple of days. It hadn't arrived by the Friday so I emailed asking about it and they asked me to give it a few days which I did. It didn't arrive by the Tuesday so they agreed to send a replacement. Both items arrived a couple of days later.
They were only worth about £20 each, not massive, and I kind of assumed that the company would write off the first item or claim back from Royal Mail. A few weeks later I received an email saying Royal Mail had informed them of problems with a batch of mail that had since been delivered and would I please return the first item.
I completely forgot to reply (baby brain) and have just received a letter with return envelope to return item or send them payment. I appreciate that technically I have an item I haven't paid for, but that was only sent out because they didn't fulfil their own advertised delivery which left me in limbo waiting for it. I think it would be good customer service to have just said to keep it. WWYD?