
New Scanlation - Giraud's first comic strip (1956)
This appears in the The Emerald Lake: From Gir to Moebius where it is labelled as the earliest example of a Giraud comic strip. It is untitled and I'm not sure if this was published anywhere until decades later.
I think the art here is already quite good, although possibly very derivative of other artists of the time (I don't know what comics he would have been seeing prior to this). The final panel is good except I personally think it would work better to leave out the line of Mr. Tiburce screaming in frustration, just end it with the confounded worker's statement as the punch line.
Also, very lucky for the sake of translation that "silence" is the same in French and English!