I guarantee that's how my dad got those books, prolly a birthday present from his sister or mum. I have them now, because I still go through them lol it's fun seeing a comic online and being like "oh! I have that one!" 😂
Such a far cry from the days when it was hard to find Far Side comics online because Gary Larson didn't like it. The genie has long since been out of the bottle. We had a big collection at home growing up and there are so many cultural/environmental references I only began to understand in my 20s.