Avisek i bought this arowana from a friend.
Yes they do have an website where you can check the tagnr but when i did it came back with not finding any fish så i dont know hos legit their site is.
I wouldn't overly worry about it -- I had the same problem with checking my BBXB's cert (from Sianlon, one of Malaysia's first CITES registered Arowana farms which has been around since the early 70's). Basically I think some of the farms are kind of lazy about updating their data bases with the new numbers. After ~6 months it finally was in the database. But before that my Arowana dealer showed me the government import docs, which matched with my numbers. Also when I picked the fish out at his shop he also scanned its chip to show me it matched its cert #.