Why would a tenure-track job posting ask for an undergraduate transcript? Recently I came across a job posting for a (mathematics) tenure-track position that asks for both graduate and undergraduate transcripts to be submitted. While this is the first time I've had anyone ask to see my undergraduate transcript for such a position, from a previous question here, it appears to not quite be unheard of. 

What I haven't seen addressed is the question of why, generally, would a hiring committee ask for undergraduate transcripts? Are they really going to judge my application based on an errant C in a course unrelated to my field, or do they simply want proof that I have the degree from University X that I claim to have obtained? 

The reason for my question is that I am hoping to gain insight into any issues that might appear in my own transcript in order to address them in the cover letter.
I had to submit undergraduate and graduate transcripts to several schools each time I applied for jobs in mathematics. I believe the main reason is simply to allow the school to verify that you really have the credentials you claim. 

There have been examples where faculty and administrators were caught claiming credentials that they did not possess, so schools are more cautious about such things now. The same is true for background checks - many schools now run a background check before they make an official job offer.  

At my institution, when we have a mathematics job search we don't really look at the grades on the transcripts. The cover letter, reference letters, teaching statement, and research statement are scrutinized, but the transcripts just get a cursory glance to make sure the person has the right coursework (e.g. if we want to hire someone in a specific subfield, we might check that they have coursework in that subfield).