The depleted handicap division may soon receive a boost as last year's 3-year-olds make their way back to the races. Dollar Bill returned at Fair Grounds March 8, winning a contentious allowance heat and Invisible Ink is entered in a seven-furlong allowance race at Gulfstream Park Wednesday. Also at Gulfstream, Outofthebox returned to the work tab Sunday morning.Peachtree Stable's Invisible Ink, second in last year's Kentucky Derby (gr. I), hasn't raced since finishing fifth in the Belmont Stakes (gr. I) last June. He will start Wednesday's race from post-position 11 under John Velazquez.The Todd Pletcher-trained 4-year-old son of Thunder Gulch has won three of nine career races for earnings of $415,560. He finished third in last year's Florida Derby (gr. I).Meanwhile, Super Derby (gr. I) winner Outofthebox worked three furlongs in :37 1/5 while breezing at Gulfstream Sunday morning. The 4-year-old son of Montbrook was working for the first time since injuring his ankle in January."I just gave him an easy trial for his first workout back," Flint said. "He suffered a minor injury to an ankle back in early January. It'll still be a while before he's ready to race again."Following his Super Derby win, Outofthebox finished third in the Fayette Stakes (gr. III) and ninth in the Clark Handicap (gr. II) in his first attempts against older horses.Outofthebox's Fayette was won by Connected, who finished third in Dollar Bill's return race at Fair Grounds last Friday.