NUCs normally have their machine specific data in NVRAM, dump the complete firmware or the bios region with intel ME tools (version corresponding to Intel CSME) from here, section C2. (CS)ME System Tools and check NVRAM for entries before AmiStandardDefaultVariable folder
Should look like this, DmiData and UUID. MfgMode and Guid1394 might be FF (pic from NUC7 or NUC8)
I never used the integrator toolkit, maybe it’s possible to enter the values with it, too.