I guess it depends on each individual and what they decide is okay for them to buy/use as a vegan.
I personally don't get myself to involved in things like glues used in shoes, stearic acid used in tyres, animal fat in plastic bags etc. because they are hard to avoid and aren't properly labelled. And if I spent my time trying to find out from every single company I would probably drive myself crazy and lose my original motivation for becoming vegan.
To me I see the fact they are made in sweatshops overseas more of a problem than them maybe containing animal glue. But If it bothers you then just pop them through an email and they hopefully will be able to give you an answer