If you mean you bought them at the weekend; then they should have been tagged before loading into the trailer and tag numbers noted on the movement form, so in effect they shouldn’t have been moved without tags.
If this is the case, I would order double RED replacement tags for them with your flock number on, ASAP. Red tags show they were not born on your holding.
Note this advice is for England only- I think the rules on tagging in Scotland are different.