The Modern Forgery Hypothesis

[oshfdk]

That would be an extremely unusual use of seal wax.   And besides seal wax is not supposed to be sticky when cold.

I personally know nothing about the use of seal wax, but in the video below using wax on the inside is demonstrated as one of the standard techniques of the XVI century. 

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Edit: I suppose they know what they are doing:

"Produced by MIT Video Production. Directed and demonstrated by Jana Dambrogio. Funded by Dambrogio and MIT Libraries. Special thanks to Ayako Letizia, MIT Video Production staff, Mary Hurley, The British Academy, and Lincoln College, University of Oxford.

Citation information: Authors: Jana Dambrogio, "‘Tuck-and-seal,' Italy (1580s)," Letterlocking Instructional Videos. Unlocking History number 0011/Letterlocking Unique Video number: 011. Date filmed: June 2014. Duration: You are not allowed to view links. Register or Login to view.. Date posted: June 2014. Video URL: [Insert URL]. Date accessed: [Date].

Copyright 2014–present. Jana Dambrogio, the Unlocking History Research Group, and the Massachusetts Institute of Technology (MIT). All rights reserved. The following copyrighted material is made available under the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) License You are not allowed to view links. Register or Login to view.. Contact the MIT Technology Licensing Office for any other licensing inquiries."