The origin of Fabrizio Salani's "AG" monagram

[Fabrizio Salani]

Wat would be a legit reason for cutting out a wax seal and gluing it to another document? Doesn't that invalidate the point of a seal? It's like cutting out a signature and gluing it onto another document.

No, indeed, the affixing procedure is correct: the parchment onto which the cardboard ribbon to close the package is glued (but it could also have been silk or cotton) and above it the corroboration seal to secure everything. I forgot, in the trace of the "to loose" seal underneath, typical of Roman "litterae clausae," there is no trace of glue, only the oil from the sealing wax and traces of the wax itself.
I republish the example of Litterae Clausae made with a simple 3D design.