Well, then the droid does belong to you.
Luke: the droid says he belongs to you
Obi Wan, who knows full well that is anakin’s fucking nightmare robot: i don’t recall
it is possibly technically true that obi-wan did not, personally, himself, ever own a droid. notice he doesn’t say that he doesn’t know Artoo, just that he doesn’t recall (shifty word) ever owning a (indefinite article) droid. what droid? any droid. that is exactly the type of lie he specialized in.