any red flags here...................?

SUMORADA

1956 sealed sets.....................150136513105

droopyd

If ya hafta ask, there probably should be.

ModernCrapNut

The sets came from the mint unsealed.

grabba

Envelopes look too clean and crisp to be original.

GrumpyEd

A lot of people try to pass them off as "never seen" but they probably have been looked at. I'd rather buy one I can see.