The corks do not match those used on normal Moet & Chandon Ice Imperial bottles and the bottles themselves appear to have been emptied of champagne and filled with pure liquid MDMA.
The tampering did not occur at the site of the producer, Moet Hennessy, and is reportedly being blamed on drug smugglers.
The liquid in the bottle is a reddish/brown colour, with a fruity smell that is not "champagne-like".
Tainted bottles are also not carbonated and contain no bubbles.
The initial warning was for Moet & Chandon Ice Imperial 3-litre bottles with the lot code LAJ7QAB6780004, the updated warning includes bottles with lot code LAK5SAA6490005.
The fatal German case occurred in February at a restaurant in the town of Weiden.
The deceased, named as Harald Georg Z, collapsed after one sip of the liquid and died before he could reach hospital, Bild reported.
Authorities who tested the bottle said it contained as much as 100g of the drug.
A standard dose of the drug is about 100mg on the street - meaning the bottles contained a thousand times that.
A spokesman for the NVWA told the Daily Mail: "Even dipping your fingertip into the liquid and tasting it can cause serious health problems, even if you don't swallow it.
"People should also not touch, let alone taste, the contents. Taking a small sip can be fatal."