i wouldn't even worry about him until a month passes and at that point you should assume that he didnt make it . even after that he can still be alive and come out so dont worry at all yet . many times their internal clock is messed up because his days are our nights and he needs some time to get aquainted with his new time zone .
i will admit that the M Geoffrey is one of the more delicate leopards so that is the down side but all you really can do is be optimistic and let nature take its course . also dont go trying to dig him up as he is where he wants to be at this point ,its his "safe zone" so let him be and see what happens .you may also stay away from the tank at night and see if he pops out for a minute or two as many times they do come out but as soon as they see movement from outside the tank the quickly bury under the substrate .
good luck and keep us posted