Has anyone else had problems with air mail envelopes from Bill Plum? I purchased them about 2 years ago at Dayton. The return envelopes seem OK but the Larger out going ones have very little glue on the flap requiring them to be taped. Some have very little glue on the seams and fall apart when removed from the package. Does anyone know if Bill has an e-mail address? Doug....KD8KX