WWYD about this situation. To be clear, I've already acted, I just wondered what others would have done and what you'd expect the likely outcome to be.
I recently ordered some clothes online from a single retailer. A fairly large amount, mostly in the sale. I expected due to the number, for them to come in 2 parcels, but it didn't and they came in 1.
I opened it and tried on the clothes, sorted them in to keep and return etc. I notice 2 items missing. Went off to work. On my lunch break I went to the help page and did an online chat, saying I'd not received my 2 items. They immediately refunded me.
I returned home. Moved the parcel and the clothes I thought were missing had fallen under the parcel.
So WWYD (I've arbitrarily selected the options below):
YABU: say nothing, keep the refund and the clothes.
YANBU: tell them, offer to pay again or return the clothes.
And what would you expect to happen, regardless of which option you chose?