Metro Manila (CNN Philippines, April 7) — Sacked Interior Secretary Mike Sueno lost his post over a piece of document which he said he never received — a claim which drew the ire of President Rodrigo Duterte during a full Cabinet meeting.

CNN Philippines got hold of a copy of this controversial letter sent by Undersecretary Jesus Hinlo, informing Sueno of the Interior legal department's opinion on firetrucks acquisition from Austria.

The legal opinion, basically, advised against releasing payment while the matter was still being heard at the Supreme Court.

Sueno had maintained he never saw this document, but a look at the letter indicates that it was received by his office on November 2 last year at 9:05 a.m.

Related: Ex-DILG Secretary Sueno: No due process in my dismissal

Attached to the letter is the legal opinion itself.

Interior Assistant Secretary Ester Aldana and Fire bureau head Chief Supt. Bobby Baruelo also received the same memorandum from Hinlo.

Photos from the Foreign Affairs website show that Baruelo and Aldana were among those with Sueno in his trip to Austria last January 11-18 to inspect the second batch of firetrucks to be shipped to the Philippines.

CNN Philippines is still trying to reach Sueno, Baruelo and Aldana to get their side on the issue.

CNN Philippines' Gerg Cahiles contributed to this report.