I sincerely hope they are looking at boys currently in foster care, by doing personal home visits and actually seeing and speaking to each African-American boy in the age range that is in foster care, to rule them out as the victim. Hopefully they are looking at kids in KY as well.
Years ago, maybe 5 -10 years, TJMaxx , Marshall's, and Ross sold new similar suitcases. IIRC, there were several different designs: Las Vegas, Paris, London, Chicago , and one of the cities in Germany , either Bonn or Stuttgart. I think they were priced around $60-100, depending on the size, with the largest suitcases being the most expensive.
This particular suitcase could have been purchased at one of those stores or at a thrift store.