Gruffaloes

I had a travel bug number on a t shirt ,for piratemania in 2014. Today I swapped it back to the tag that the number came on so that I can place it in a cache for it to travel later in the week. But, people as far as France ( I'm in the UK) are now discovering it! How can this be when it's sat at the side of me ? I thought you had to physically find one to log it? So are these logs ok or should they be deleted?