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Absolutely. I would not do anything based simply on the word of the second cacher. If I was inclined to delete the log, I would first check the logsheet personally. The first cacher may have signed the log, then the second cacher could have opened it up and looked at the backside, seen no signature and jumped to conclusions.
It could go the other way, too, for that matter. It could be Cacher B got there first but Cacher A missed B's signature, thought he was FTF, and logged online first.
This just happened to me last night! I swore the logbook was empty when I signed it. Now it was dark & I was using a flashlight but when I got home there were 3 people who claimed to have been there before me and took the travel bug which I did not find but I did see te bobber they left. There were 2pencils in the box so not having a pen is no excuse. The planter has only done 3 boxes so far....I wonder what he'll do. It's close enough I can go check myself in the daylight....or should I e-mail him?