I have found some mint plate blocks stuck to the cardboard holder and stuck to themselves. They are luckily only stuck at about three points, but still not able to safely separate with tweezers.
Shall I experiment with the "patented" StampLift sweatbox that came with my Grandfather's collection.....or do you have advice on how to separate mint stamps stuck to each other. Image included.
Sorry, but I have no secrets for doing this other than what you suggested - using a seat box. But even there, I have no personal experience with one. You should consider joining the Virtual Stamp Club where you can also seek advice from a wide reading audience. At www.virtualstampclub.com.