'Baby Grace' Sketch Released

Authorities released an image of the Tiara model shoes that are "nearly identical" to the ones the girl was wearing. They are a children's size 8½, white with purple trim and lights in the heels.

This photo released by the Galveston County Sheriff's Office shows shoes identical to those worn by...

This photo released by the Galveston County Sheriff's Office shows shoes identical to those worn by "Baby Grace." Police plan to release a sketch of the unidentified girl, whose body was found by a fisherman Monday night locked in a plastic container on a sand bar in Texas.

(Courtesy Galveston County Sheriff's Office)

As investigators comb through national missing persons databases for possible matches, authorities are eager to elevate the profile of the case. Since the girl was discovered Monday night, they've received some tips but none have proved viable.

Someone out there, the sheriff said, must have information about this little girl.

"In this world, it is possible for a family to not know a lot of people," Leonard said. "But rarely do we have an instance where a child is unknown to no one outside his or her own family."

Anyone with information about the girl can call the Galveston County Sheriff's Office at (866) 248-8477.