some sale barns have a precon/vac program. One color tag indicates weaned for 45 days, bunk broke, casterated, all shots a,d boostered atleast 14 days prior to sale ....next tag color is just casterated, and shots not weaned, or broke, etc. I would assume that would be the case at the sale you attended. One sale barn near here you buy the tags from them and turn in a signed statement from the vet, or any vaccine recipts. Be brave....ask the guy next to you ;-)