Hi, If Beckett has the ability to grade them, there is no reason why PSA cannot. As far as your question about fake/ trimmed cards in BGS holders, I would say fakes are very low, no more prevalent than other issues. Trimmed cards are another story especially with old flips, there is a degree of variability to cuts on some. Also keep in mind that beckett won't grade the best of best, magic johnson subset, sealed bags, and recently I have heard they won't grade best of the old/new either, although that isn't explicitly stated on the site.
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