... I have had success in seeing itineraries booked by my TA in Sabre on the virtuallythere.com site, where you can view and print a copy of the e-ticket receipt. However, I think the TA has to include your email address in the reservation for you to be able to view it at that site.
This is a security feature of Sabre (and a very annoying implementation). The record is invisible until the TA or airline enables the record for web view (and this is rarely done, even upon request). While Amadeus defaults to showing it.