Not quite a substitution, but about fifteen years ago, fairly new to online shopping, I received a large quantity of expensive frozen ready meals together with my order of fairly basic staples.
I told the delivery person they weren't for me, and he scratched his head and said someone had made a mistake. He said they couldn't go back after issue, so please accept them with compliments.
I was extremely hard up at that time, really struggling, so that extra food was a godsend!
Times are easier now, so I try to keep the good luck alive by shoving some tasty bits and pieces in the food bank.