Oh I have happy news to report! I called up my boutique and asked them about the serial number, price and material of the bag and from the serial number provided, it is the same as the one posted in the link by
@viewwing! Apparently the care card states that the material is "garni cuir" which is supposed to be synthetic leather, according to the SA. Not sure why the care card would read anything other than "polyamide canvas" and why it feels so sturdy when the raincoat above looks quite light but from the serial number, it is the same bag as in the link