Bart Ehrman assures us he did.
So what led to the doubts in the first place?
The Bible Geek broadcast of April 12, 2012: http://www.ustream.tv/recorded/21808446
About four minutes in Robert Price says:
I and others have expressed that while we are not at all surprised that NT scholars don’t buy the Christ Myth hypothesis for various reasons, we were pretty surprised reading this book [Did Jesus Exist? by Bart Ehrman] at the poor quality of it, the blatant and systematic misrepresentation of Earl Doherty and Acharya and some others and utter failure to come to grips or even to understand certain theories and arguments by myself, by Frank Zindler and G. A. Wells and others where you wonder, “How can this guy who is so astute as he shows in so many of his writings do such a superficial and unfair hack job here?” (I’m sorry to say that but let’s be blunt though). Well, I think I found out today how this anomaly developed.
A Bible Geek who shall remain nameless just so he doesn’t get into as much trouble as I am about to do, though he can come forward and verify if he wishes, was talking to one of the graduate assistants or students of Professor Ehrman at Chapel Hill. What do you know! He didn’t even read the damn books. He just farmed them out to students who did reports on them on the basis of which he leveled his criticisms. Now I get it. I guess this doesn’t merit an appendix in the book Forged because it’s not exactly a forgery. . . .
Then on the broadcast of April 16, 2012, http://www.ustream.tv/recorded/21906896 he says about 29 minutes in:
Now he defends his not having read them because it has got out that he had his graduate students read the books and report to him. Well, he says, “Oh, that’s common procedure.” Bullgeschichte! If I assigned a paper and found that a student had had his team of people do the research for him he’d get an F. You can’t pretend to evaluate complex scholarly works based on the Monarch Notes provided by your students. . . . Well he had them to show him the parts of the books he needed to read. Well I’m sorry but you’ve got to read my whole damn book if you’re going to evaluate it as I would read all of yours. You can’t leave it to other people. It’s disgraceful, really, really disgusting. This guy is sinking in my estimation to the level of William Lane Craig.
I think it would be better for Bart Ehrman to have done what Robert Price understands he did than to insist that he read them all himself very carefully. The former gives him some excuse. The latter potentially leaves him open to the charge of incompetence or worse.