The Long Haul, the 497th's unit history published in 1947, is on line, and can be downloaded at
http://digicom.bpl.lib.me.us/ww_reg_his/106/
It has a mission list near the back of the book. It shows a single mission in the November gap period. On November 10 a single B-29 flew a reconnaissance mission to Tokyo at 32,000 feet. So in this case the problem is not with Fold3. One would have to go back to the original sources to see if this was
Thumper.
Enjoy!
Frank.