Yes.
No.Isn't there a risk they'll rot for any folks who don't realise they're there?
No.Is this a problem for vegetarians
There's a spectrum there. I was once invited to a birthday party so long as I didn't wear anything that was leather. If you're okay supporting a man who has contributed a lot to the leather industry, indirectly or otherwise, but not okay with feathers being hidden in the box, you'll probably want to pass on the boxed vinyl....or vegans?