A crow once sneaked quite far into my mechanic's shop without being seen, got up on a rolling toolbox and stole a bag of sunflower seeds without being noticed. I found this because I saw a crow and their other crow buddies were having a sunflower seed party in the alley, and one of the mechanics lost their snack.
Also, crows will remember if you help them for years. People make a point to make friends with them because they have been known to bring gifts and visit year after year. Probably better company than the in-laws too. There's a number of documentaries and personal videos on YouTube about this topic.
PS: Davis CA has zillions of crows. An apartment I rented had large trees at the street containing easily several thousand in a dozen trees where they bedded-down for the night. The sidewalks and streets were coated white with droppings like it was SF's Fisherman's Wharf. Needless to say, no one used those sidewalks. And you could hear when they came back, because it sounded like a crow cocktail party.