I think it depends where, in BWCAW for example, no, I would not honor it. If I were in a fowl mood I might even throw it in woods and claim "what pack, there was no pack when I got here" In Quetico, maybe. Wabakimi, WCPP, yes.

Note to woman with friend who was bumped off campsite by another group in BWCAW, there is no rule stating that if somebody is camping at a site you cannot. The only rule is that there cannot be more than nine at a site, you could have told them you were camping there and they were welcome to as well.

They sound like pricks though, so maybe not people you want to be around.