大英博物館早期南亞及喜馬拉雅收藏前館長Michael Willis在2012年提出指控，稱發掘出的骨灰罐上的銘文，是德国人类学家費洛偽造而成。歷史學家Charles Allen，在他2013年的記錄片《Bones of the Buddha》和著作《What happened at Piprahwa》中，研究舉證這種偽造是不可能的。印度學教授Harry Falk也在記錄片種聲稱這種偽造不可能。
- . In his review of Harry Falks new book "Aśokan Sites and Artefacts", Dr Michael D. Willis comments: "As the question of fakes is raised by Falk himself, it is noteworthy that the author has side-stepped the Piprahwa reliquary in the India Museum, Calcutta, in all likelihood a forgery made by A.A. Führer whose activities are explored elsewhere in this JRAS special issue. The decision to side-step this problem was a wise one as its inclusion would only detract from the volume as a reference work." in Dr Michael D. Willis (2012) in reviewing H. Falk, Asokan Sites and Artefacts. A Source-book with Bibliography (Monographien zur Indischen Archäologie, Kunst und Philologie, Band 18), Journal of the Royal Asiatic Society (JRAS), 3rd series, Vol. XXII, Part 1, 2012, p. 188
- Allen, Charles. What Happened at Piprahwa (PDF).