Mine came yesterday too. I didn't get home until nearly 9pm but had to open it and play a little. My day to day kitchen knives were horribly dull. A few minutes on the 120 grit improved them. They also need at least 400, probably 1000 grit attention too. I was somewhat surprised by how fast the 120 would remove metal.
I noticed there was a return shipping label with the bill of material on the top of the box. Mine was all intact but if you need to ship it back, it appears there is information for that purpose on the box. You should detach the BOM and review it if you have damage.
I also ordered an extra glass disk through Amazon from Hartville. I was just under $20 with shipping. If you go to the Hartville website they want $20 + shipping. I ordered extra paper including micro mesh sheets from Klingspor.
Jim