Nope. You've beaten me with that one.
The paint on one of them looks a bit like Thames Blue. I can only think of 2 places on the Minor where there are 2 bolts that close to each other, being the top outer edge of the front panel and the bottom of the rear corner of the front wing. I can't think what they would be doing there, though.
Sure they're card and not Asbestos?
Where are you located, Doug? Got any photos of the car?