Collectables has for years been issuing Atlantic, Columbia, RCA, Capitol. And not strictly 50+ year-old stuff like the European reissue labels. Why do you believe them to be less than legit? Simply because the clearance costs are high? Perhaps they have wealthy investors backing them. They certainly do not hide like the typical rip-off Andorran companies:
Collectables Records Corporation
P.O. Box 35
Narberth, PA, 19072-0035
They have excellent distribution. If they were not legit, as a U.S. company they would have been crushed by now.