Just a follow up on my GFD's, luckily none of them gave birth!

Next dilemma though. When these sheep arrived, I noticed all the ewe's had metal tags which were from the GFD society. This morning, however, when I was checking them, I noticed that at least three have lost their tags.
Not really sure what to do next. I have been hunting high and low for the paperwork that I was given with the sheep, alas, I cannot find it.
Just wondering where to go from here. Can't seem to reach anyone at the society yet.