I know the point you are trying to make, but in the instance of my rabbit looking for her partner, it was clearly that. She wasn't looking for a "source of a smell", she was acting abnormally going into rooms and on furniture that she never goes onto. She has never perioscoped before or since, which she did for a week after her partners death. She clearly missed her partner, was clearly not her perky and alert self with her ears and head down.
Smiling photos and a lady putting a blanket on a cage at bedtime are a different catagories and don't apply to my rabbit pining for her partner.
I have noticed now that often when there is disagreement among people whether or not animals are sentient beings, there are examples like this meant to be comparable, but just are not, which try to "prove" that animals do not have feelings.
I'm not saying they don't have feelings, just that we shouldn't confuse our feelings with theirs because their perception of the world is quite different to ours - mainly because we have imagination and they don't. Memory and imagination are quite different things. I know my animals remember feeding time for instance, but they can't sit there and imagine what it might be like to eat something they haven't eaten before, like we can.