I had a friend that had a large collection on display, most of the SGC flips turned brown under the florescent lighting. It was due to the paper that SGC uses, more like the old thermal fax paper. A few of the cards faded badly and some of the wax packs and boxes, but most didn't.
There was a guy that posted a video on CU years ago of him taking a PSA holder to home depot, attaching it to a paint can, and turning the shaker on for 3 minutes. No damage at all. He then threw a few holders in the dryer and let it go for half an hour, again, no issues.
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