I bought a Corruscans from a well know fish distributer and my juvi looked just like yours. I grew it out to about 20" and it never turned to all spots like the ones seen on pictures. So either they don't get the spots until way older or the ones you and I have are a different species. To be honest it looks like a regular tiger shovel nose.
More pics please!!!! I saw two bags lol... I have to agree with ultimatejay, not corruscans. Looks like a Recticulatum to me. Check out the I.d. Sticky. There's some decent pics of my 30" Recticulatum, same overhead head shape and pattern. Still hard to come by for a tsn, one of the largest growing also.