I think you might have problems with those huge tags.... they are an accident waiting to happen !!!
It is sad that such large ones have been used because there are some very small ones about.
They look like cattle tags.... are you sure they have got a goat herd number on them. I recently came across a situation where a guy had used up his sheep tags on some goats...... caused quite a problem with Trading Standards because the numbers had been allocated to sheep.