Guess what I found today!!!
But, Funny Frog didn't help - we tried for two caches and didn't find either. We sat near 2 others, and with jumpy GPSes, we decided to not even try.
Then we went to find the 10th Thunderbird track and couldn't. We have caches prepared for the other 9.
However, we were successful in completing the placement of all 10 Thunderbird caches - one will just be where we guessed the bronze track used to be.