Envy was borrowing books from the landlord's family, mostly because they'd be largely science books and therefore something he'd be interested in, which was why he turned down Winry's wife's offer. It kept him entertained while Ed slept or moped or went through various therapies to build muscle tone back up that his alternate had let slacken.
Leaving a Gate cat in charge of protecting Ed for a few minutes while Envy returned a book and got a new one, Envy headed outside of the clinic, walking towards the first apartment building.
That's when the wind brought him a familiar scent. Setting the book down by the patio door of apartment 3/4, Envy cautiously followed this scent to the edges of the grounds.
Ah-hah. Finally, the bastard shows his face.
"Looking for something?" Envy called to his much younger alternate.