Yes it was yours.
No, the cracked jewel wasn't a show stopper...I removed it, and installed a fresh new un-cracked jewel. The old jewel will be returned along with the watch so you can inspect it.
I consider this good luck, had it not been sent in for servicing, the cracked jewel would cut into the pivot and eventually cause the escape wheel pivot to fail, when it failed the mainspring would be disconnected from the escapment and free to turn, and it would unwind in a milisecond and destroy the movement, and probably destroy the dial and hands as well.
It goes to show once again how important servicing is, and how important it is to look at everything under a 10X loupe, nothing should be taken for granted, even on a new movement. Cracked jewels are very rare, I suspect that whoever cut off the seconds post, didn't remove the escape wheel, and with the seconds post wheel sitting under the escape wheel, you have to force it out of the movement, which put pressure on the escape wheel, and it's pivot, cracking the jewel....
Watch is being tested and monitored and working perfectly so far.