Slightly OT, acrylic and glass just beg for problems. My life became so much easier when I went to canvas. Now the only troubles I have are packaged pieces mauled by forklifts during shipping. But insurance covers that.
BTW, even the most reputable galleries usually state an "all sales are final" policy on their receipts and contracts, and often on signs near the POS. What you see is what you get. But OTOH, most are quite willing to accommodate clients with issues, it's just good karma as we have discussed. At artfairs I tell people I will fix or replace pieces that are damaged in transport or hanging. Have never had to do that, and that sure does help the sale move forward.
An interesting twist is the concept I see recently at some Santa Fe galleries is that "the framing is free, a gift from the artist." They will happily remove the art from unappealing frames, but with no affect on the price because all you're actually paying for is the art. Food for thought. So don't complain about scratches on your gift frame, you ingrates!