Caterpillar had a huge corporate archive in Illinois. I do not think that the records survived the transition to Texas. There has been no mention of them here for several years.
I tried for years to access information from the Caterpillar archives without any success. I wrote multiple letters and tried several other routes and the staff at Caterpillar did not even have the courtesy to respond and say no - they just ignored me.
I attempted to find some records on a tractor several years ago. I was able to talk to a couple people and found out that most of the records before 1953 were destroyed in a flood. They did not have any serial number lists at that time.