THE flea-COLLAR??

There's SOMETHING About THE HATCH!! Yes, indeed. I think THERE's FLEAS inside the HATCH!! WHY else would JACK wear A FLEA collar TO enter THE hatch?? This is A Very WEIRD discovery!! I feel like Cherlock Homies!! But THEN there's THE NEW question!! Where did THE flea COLLAR come from?? Vincent DIDN't HAVE one!! OR have THE LOST-people been PLAYING dirty GAMES??