Need help with cash and tool system? [closed]

Hello! I'm working on a christmas game. So how the "system" works in the title is: So a player grabs a tool(in this case, a present) and drops it into the chimney (part), and the player gets cash for it. I'm having trouble with detecting if the player owned the specific present, and not anybody else (so players cant steal each others presents). Any help would be appreciated!