Just for info - Jack Russell's can't be registered as a pedigree, as they aren't recognised by kennel club. Hence the lack of papers. Since 2008 they do recognise a Parson Russell Terrier, which is a variation of Jack Russell. Can't say i've seen many advertised though.
Such a shame to get rid of a puppy after just a few weeks. Also A terrible time to look at re-homing as Christmas is just around the corner, and people still buy dogs for presents without thinking. It could end up back on here mid January...
Hope he does go to a loving home that wants and keeps him though.