At the appropriate time, IFAR will ask to examine the work in person. If necessary, we will recommend laboratory analysis (e.g. X-radiography, infrared reflectography, pigment or media testing, fiber analysis, etc.), often at additional cost.
https://www.ifar.org/authentication.php
If nothing else the scan would have picked it up. There is absolutely no way they just overlooked a fuckin shredder and an engine in the frame.