Le Sanscrit text of the Bodhicaryâvatâra was published by Ivan Pavlovitch Minayeff in the review Zapiski, IV, 1889 under the title «  La doctrine du salut dans le Bouddhisme postérieur. » (The Doctrine of Salvation in later Buddhism). It was his last publication.

I.P. Minayeff (1840-1890) was very productive during his life, and he published many texts on Indian Traditions, including Buddhism, starting in 1862. Most were in french, and published by the Saint-Petersbourg Academy. Here is the Minaev Ivan Pavlovich list of books and essays. On Indian Traditions, here are some of the main titles which may have been spotted by Mme Blavatsky :

1869. Pratimoksha sutra, text and translation

1872. Some words on the Buddhist Jatakas

1874. Indian Stories

1877. Indian Legends and Stories

1883. New interpretation of buddhist legends

1885. The Chakesa-dhatu-camsa, The Sandesa-kathâ

1886. Anâgata-vamsa, Gandhavamsa

1887. Bouddhism : Research and materials

1887. Simâ-vivâda-vinicchaya-kathâ

1888. Lamaïsm (review of M. Pozdniéef book on buddhist monasteries in Mongolia)

1888. Candragomin

1888. Review of Legge (J.A.) – Record of Buddhistic Kingdoms

1889. Kathâvatthu-pakarana-atthakathâ

1889. Petavatthu

1890. Bodhicaryavatara sanskrit text with introduction

not published : Cânakyasârasamgraha

post-mortem (published in Zapiski) :  Notes and materials regarding buddhism (translation of the Petavatthu) ; Analysis of some pali jâtakas not yet published; Mahâvyutpatti Index; Some tales from the Buddha renaissances; Researches on Buddhism; Researches on Buddhists and Jains.