I would say Reticulata.. could be some morph, but as common as 'teacup' retics are, that would be my guess.. They have a real nice pattern though.
Tiger Rays usually don't live through Importation at the 5-7" range.. and if they did, they would have an outragous price tag, and a LFS usually dosn't have that kind of overhead to work with. Definately not a tiger for these reasons, IMO.