Video posted by Burbank Sports Cards on Instagram

I would say those slabs were just glued together and not ultra sonic welded.

I know some chinese website sell empty slabs now. Probably where this company bought those slabs.
 
FWIW, PSA slabs until recently were just as easy to pop apart. A quick twist of the wrist usually did it.
 
The owner of the grading company released a statement re the video. Claiming those were mistakes and they will fix any slabs with that issue free of charge.
 

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