Did the seller tell you when you purchased? If not, did he have an explanation for not telling it?
No, he told me after he shipped it. Over 3 weeks after I paid. I asked why he didn't tell me before and he gave a poor explanation about being busy, not having a box etc. Of course that didn't stop other bikes being advertised at the same time.
To add to the above, it turned up dreadfully packed with the forks sticking out of the bottom and the wheel axles out of the side. It wasn't damaged but only by luck.
I have contacted him since. He says it will be reasonably easy to remove the stem (I've already tried the usual methods) but has been silent since I asked him how. I'm sure I'll get it out but a bit disappointing really although thankfully the bike is otherwise fine.