Mahāyāna in Gandhari literature

Lecture 1 states "As yet, no traces of Mahāyāna Buddhism have been found in ancient Gandhari literature."

This doesn't match other sources which suggest that the recent finds from Gandhara contained both Mahayana and early schools literature:
http://www.tricycle.com/feature/whose-buddhism-truest
http://www.en.uni-muenchen.de/news/spotlight/2013_articles/buddhism.html

How to reconcile these conflicting pieces of information?

Mahayana in Gandhari Literature

Denis, thank you for pointing out the new findings. The lecture notes were based on old information which is now outdated. We have deleted the paragraph from Lecture 1. Well done!

Wong Ping Ling.