PSA graded packs

How the heck do you break packs out of these holders? I have been buying the GAI stuff and scissors are all you need. I just bout some 73 and 74 packs from BBCE and they are PSA graded. This things are not going to be easy to get out. Any ideas?
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Always looking for Topps Salesman Samples, pre '51 unopened packs, E90-2, E91a, N690 Kalamazoo Bats, and T204 Square Frame Ramly's