We have a series of caches nearby, one on each bridge over a major road. After finding one with the GPS, we easily found 4 others. One had a FTF badge in it and it looks like it hasn't been published on the website yet. We just assumed it was part of the set. We obviously can't log our find at the moment.
Were we wrong to sign the logbook? We didn't realise our mistake until we got home. Advice please!