Detectives found a similar trash bag in the dumpster, with blood-soaked napkins and a receipt from Fantastic Beauty Supply, a store in Deerfield Beach whose system can store customers’ telephone numbers. Employees were able to match the receipt and provide deputies Sousa’s phone number, a sheriff’s arrest report said. Deputies then determined Sousa lives in an apartment near the dumpster, in the 10300 block of Boca Entrada Boulevard.