what species ?

there was a RM1500 ocadia sinensis in jakarta a while back... LOL!!!
ko biar benar 
based on your (vague) description, my guess is you could have stumbled upon either:

i) Elongated tortoise
ii) Someone else's missing star or radiated (hands licin sikit) or some other valuable tortoise
iii) Something else that you totally misIDed

if it was either (i) or (ii), i'd say... your lost dude!
nothing came out of drain for me except boxies and res.