No I don't have an idea, and have relied on advice off people, and this forum. The breeder said when they delivered that they didn't need their tags in, so I thought that was ok, then another person who bought pigs off the same breeder as me, has told me we should have had them with tags.
It's a minefield, I thought keeping pigs would be a doddle - but keeping horses is much easier
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Don't worry - the breeder was right that they didn't need tags, although they should have had a temporary mark - but the temporary paint mark is exactly that - was supposed to last the journey, no more, so if the breeder didn't mark it, too late and no problem now.
As stated, no need to do any ID until they go to slaughter, your "other person" is mistaken.