Since Dumbledore’s murder, the Order had basically scattered. Snape's betrayal meant that Grimmauld Place could no longer be used as headquarters, so Sirius, Remus, and Harry had relocated to The Den. Harry remained under the trace until his 17th birthday the following week, but thankfully, Tonks had been running interference at the auror's office, keeping the location of Remus’ old home under the radar. Sirius and Remus both, however, were keeping a particularly close watch over the boy, not necessarily because they were worried for his safety, but because it felt like he was keeping secrets. Sirius had noticed that Harry was stowing away various items, and articles of clothing here and there when he thought his godfather wasn’t paying attention, but Harry should have known better; it was impossible to sneak past a Marauder.